BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//CERN//INDICO//EN
BEGIN:VEVENT
SUMMARY:Cyclic Kuramoto models and Byzantine attack
DTSTART;VALUE=DATE-TIME:20201203T171500Z
DTEND;VALUE=DATE-TIME:20201203T171600Z
DTSTAMP;VALUE=DATE-TIME:20230209T100500Z
UID:indico-contribution-359@zakopane.if.uj.edu.pl
DESCRIPTION:Speakers: Paweł Góra (Jagiellonian University)\n\nCyclic\, o
ne-dimensional Kuramoto models with various types of interactions are revi
ewed. Ruch models are less resilient to Byzantine perturbations than a cla
ssic solution would suggest.\n\nhttps://zakopane.if.uj.edu.pl/event/16/con
tributions/359/
URL:https://zakopane.if.uj.edu.pl/event/16/contributions/359/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Super-spreaders in the Corona Epidemics
DTSTART;VALUE=DATE-TIME:20201203T080000Z
DTEND;VALUE=DATE-TIME:20201203T083000Z
DTSTAMP;VALUE=DATE-TIME:20230209T100500Z
UID:indico-contribution-418@zakopane.if.uj.edu.pl
DESCRIPTION:Speakers: Kim Sneppen (Niels Bohr Institute)\n\nRecently a pow
erful example of a replicating nano-machinery entered our society. In prin
ciple it’s just a normal disease\, that one attempt to model with 3 or 4
simple coupled equations with 2 important parameters: a timescale\, and a
replication factor (the famous $R_0$). And then one try to guess how chan
ges in society changes $R_0$ and perhaps adopt some more or less strong lo
ck-down measures. However\, this virus have more “personality” than th
at. It behaves different in different persons\, and persons behave differe
ntly. Presumably only a few of us infect a lot\, while most does not infec
t so much. This assumption is supported by the observation that couples li
ving together only infect each other with about 15 percent probability\, i
ndicating that most infected people are not really infectious. I will disc
uss this and other aspects of Covid-19 in perspective of models that descr
ibe heterogeneous individuals in a society. In particular we suggest that
limiting superspreading opportunities is a cost effective strategy to miti
gate Covid-19.\n\nhttps://zakopane.if.uj.edu.pl/event/16/contributions/418
/
URL:https://zakopane.if.uj.edu.pl/event/16/contributions/418/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Continuous time-reversal and the thermodynamic uncertainty relatio
n
DTSTART;VALUE=DATE-TIME:20201204T122000Z
DTEND;VALUE=DATE-TIME:20201204T124000Z
DTSTAMP;VALUE=DATE-TIME:20230209T100500Z
UID:indico-contribution-395@zakopane.if.uj.edu.pl
DESCRIPTION:Speakers: Shin-ichi Sasa (Department of Physics I\, Kyoto Univ
ersity)\, Andreas Dechant (Department of Physics I\, Kyoto University)\n\n
We introduce a continuous time-reversal operation which connects the time-
forward and time-reversed trajectories in the steady state of an irreversi
ble Markovian dynamics via a continuous family of stochastic dynamics. Thi
s continuous time-reversal allows us to derive a tighter version of the th
ermodynamic uncertainty relation (TUR) involving observables evaluated in
different physical systems. Moreover\, the family of dynamics realizing th
e continuous time-reversal contains an equilibrium dynamics halfway betwee
n the time-forward and time-reversed dynamics. We show that this equilibri
um dynamics\, together with an appropriate choice of the observable\, turn
s the inequality in the TUR into an equality. We demonstrate our findings
for the example of a two-dimensional rotational flow and discuss the role
of the observable close to and far from equilibrium.\n\nhttps://zakopane.i
f.uj.edu.pl/event/16/contributions/395/
URL:https://zakopane.if.uj.edu.pl/event/16/contributions/395/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Thermodynamics in biology: From molecular motors to metabolism
DTSTART;VALUE=DATE-TIME:20201204T150000Z
DTEND;VALUE=DATE-TIME:20201204T153000Z
DTSTAMP;VALUE=DATE-TIME:20230209T100500Z
UID:indico-contribution-403@zakopane.if.uj.edu.pl
DESCRIPTION:Speakers: Massimiliano Esposito (University of Luxembourg)\n\n
I will describe recent progress in nonequilibrium thermodynamics based on
stochastic thermodynamics and chemical reaction network theory. I will dis
cuss the relevance of these results for biology and the many open challeng
es to be addressed.\n\nhttps://zakopane.if.uj.edu.pl/event/16/contribution
s/403/
URL:https://zakopane.if.uj.edu.pl/event/16/contributions/403/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Force spectroscopy in the study of endometrial diseases
DTSTART;VALUE=DATE-TIME:20201203T172200Z
DTEND;VALUE=DATE-TIME:20201203T172300Z
DTSTAMP;VALUE=DATE-TIME:20230209T100500Z
UID:indico-contribution-419@zakopane.if.uj.edu.pl
DESCRIPTION:Speakers: Agnieszka Kurek (Jerzy Haber Institute of Catalysis
and Surface Chemistry\, Polish Academy of Sciences)\, Jakub Barbasz (Jerzy
Haber Institute of Catalysis and Surface Chemistry\, Polish Academy of Sc
iences)\n\nThe endometrium is the tissue lining the uterus cavity. The mos
t important role of this tissue is enabling the embryo to implant and prov
iding it with good conditions for growth and development.\nAccording to ma
ny literature reports\, cell and tissue mechanical properties have a signi
ficant role in many disease states. Changes in cell properties such as ela
sticity are observed in the case of various cancers or blood diseases.\n T
he main technique for cell and tissue mechanical properties analysis is Fo
rce Spectroscopy. The force curves obtained during indentation reflect the
interaction between the surface of the sample surface and the measuring p
robe. The course of these curves allows the determination of such properti
es as adhesion and Young modulus.\n In this poster\, we present results of
research aimed at checking the relationship between Young's modulus of en
dometrial tissue and women’s receptivity.\n\nhttps://zakopane.if.uj.edu.
pl/event/16/contributions/419/
URL:https://zakopane.if.uj.edu.pl/event/16/contributions/419/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Using stochastic models to describe the coronavirus epidemic
DTSTART;VALUE=DATE-TIME:20201203T083000Z
DTEND;VALUE=DATE-TIME:20201203T090000Z
DTSTAMP;VALUE=DATE-TIME:20230209T100500Z
UID:indico-contribution-406@zakopane.if.uj.edu.pl
DESCRIPTION:Speakers: Chris Robertson (Univ. of Strathclyde)\, Alan Yeung\
, Vincent Marmara (University of Malta)\, Jonathan Wells\, Adam Kleczkowsk
i (Univ. of Strathclyde)\n\nIn December 2019\, a novel new strain of coron
avirus (COVID-19) was identified as it spread through China and subsequent
ly throughout the world\, resulting in a pandemic. As the health systems b
ecame overwhelmed\, a need arose for real-time surveillance and modelling
to identify the breaking points caused by increased numbers of infections
and hospitalised individuals. We combined surveillance data for Scotland\,
detailing new COVID-19 cases\, deaths\, hospitalisations and critical car
e beds\, with a modified stochastic Susceptible Exposed Infected Recovered
Hospitalised Critical Dead (SEIR-HCD) model. The model parameters are adj
usted daily\, to fit the real-world data\, using a Bayesian statistical pa
rticle filtering technique. The estimation technique uses an acceptance/re
jection method combined with correlated multi-dimensional diffusion and dr
ift model to effectively search the parameter space. We show close agreeme
nt between data and model output and discuss how changes in parameters ref
lect the changing transmission dynamics of the virus and severity of the d
isease.\n\nhttps://zakopane.if.uj.edu.pl/event/16/contributions/406/
URL:https://zakopane.if.uj.edu.pl/event/16/contributions/406/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Energy cascade in internal wave attractors
DTSTART;VALUE=DATE-TIME:20201203T090000Z
DTEND;VALUE=DATE-TIME:20201203T093000Z
DTSTAMP;VALUE=DATE-TIME:20230209T100500Z
UID:indico-contribution-362@zakopane.if.uj.edu.pl
DESCRIPTION:Speakers: Thierry Dauxois (CNRS & ENS de Lyon)\n\nInternal gra
vity waves play a primary role in geophysical fluids : they contribute sig
nificantly to mixing in the ocean and they redistribute energy and momentu
m in the middle atmosphere. In addition to their very interesting and very
unusual theoretical properties\, these waves are linked to one of the imp
ortant questions in the dynamics of the oceans: the cascade of mechanical
energy in the abyss and its contribution to mixing. Combining the physics
of waves\, dynamical systems theory and oceanography\, I will discuss a un
ique self-consistent experimental and numerical setup that models a cascad
e of triadic interactions transferring energy from large-scale monochromat
ic input to multi-scale internal wave motion. I will also provide explicit
evidence of a wave turbulence framework for internal waves.\n\nhttps://za
kopane.if.uj.edu.pl/event/16/contributions/362/
URL:https://zakopane.if.uj.edu.pl/event/16/contributions/362/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Moments of the Van Hove dynamic scattering law
DTSTART;VALUE=DATE-TIME:20201203T172300Z
DTEND;VALUE=DATE-TIME:20201203T172400Z
DTSTAMP;VALUE=DATE-TIME:20230209T100500Z
UID:indico-contribution-420@zakopane.if.uj.edu.pl
DESCRIPTION:Speakers: Ryszard Wojnar (Instytut Podstawowych Problemów Te
chniki PAN)\n\nStudying the dynamics of a system at the atomic level provi
des important information about the behaviour of the system. For example\,
studying the dynamics of enzymes allows us to understand their biological
function. Among the available techniques\, studying the dynamics of a sys
tem by means of neutron scattering is of exceptional meaning\, as neutrons
scatter at the nuclei themselves.\nVan Hove's functions $G_s(r\,t)$ and
$G_d(r\,t)$\, as well its Fourier transforms $I_s(k\,t)$ and $I_d(k\,t$ co
ntain all accessible information on the dynamics of the system. In order t
o find the function $I_s (k\,t)$ for small times we use its lowest time de
rivatives taken at the time $t = 0$. These are also the moments of the sca
ttering law $ S_s (k\,\\omega)$. Moments of the odd orders are equal to ze
ro\, what results from the invariance of the mechanics equations with resp
ect to the time inversion. We give even moments up to the tenth order.\n\n
https://zakopane.if.uj.edu.pl/event/16/contributions/420/
URL:https://zakopane.if.uj.edu.pl/event/16/contributions/420/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Protein noise floor in gene expression: How cell growth and divisi
on contribute to it?
DTSTART;VALUE=DATE-TIME:20201204T160000Z
DTEND;VALUE=DATE-TIME:20201204T162000Z
DTSTAMP;VALUE=DATE-TIME:20230209T100500Z
UID:indico-contribution-389@zakopane.if.uj.edu.pl
DESCRIPTION:Speakers: Jakub Jędrak (Instytut Chemii Fizycznej PAN\, ul. K
asprzaka 44/52\, 01-224 Warszawa)\, Anna Ochab-Marcinek (Institute of Phys
ical Chemistry\, Polish Academy of Sciences)\n\nGene expression in cells i
s a stochastic process. Experiments have shown that noise in protein level
s does not decrease to zero as mean gene expression increases. The origins
of the noise floor are still debated. The goal of our study was to check
how several basic mechanisms affect the noise floor level. These mechanism
s are: Cell-cycle dependent gene expression\, translational bursting\, ran
dom protein partitioning between daughter cells at division\, and cell cyc
le desynchronization resulting in cell-cycle age distribution within the p
opulation. Our model gives analytical predictions of the existence of the
noise floor and it semi-quantitatively reproduces the shapes of the experi
mental noise vs. protein concentration plots. We show what additional expe
rimental information is needed for the mean-noise fitting to be unambiguou
s.\n\n[1] J. Jędrak\, A. Ochab-Marcinek\, Contributions to the 'noise flo
or' in gene expression in a population of dividing cells\, Scientific Repo
rts\, 10\, 13533 (2020)\n\nhttps://zakopane.if.uj.edu.pl/event/16/contribu
tions/389/
URL:https://zakopane.if.uj.edu.pl/event/16/contributions/389/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Packets of diffusing particles exhibit universal exponential tails
DTSTART;VALUE=DATE-TIME:20201203T110000Z
DTEND;VALUE=DATE-TIME:20201203T113000Z
DTSTAMP;VALUE=DATE-TIME:20230209T100500Z
UID:indico-contribution-363@zakopane.if.uj.edu.pl
DESCRIPTION:Speakers: Eli Barkai (Bar Ilan Univeristy)\n\nBrownian motion
is a Gaussian process described by the central limit theorem. How- ever\,
exponential decays of the positional probability density function $P(X\, t
)$ of packets of spreading random walkers\, were observed in numerous situ
ations that include glasses\, live cells\, and bacteria suspensions. We sh
ow that such exponential behavior is generally valid in a large class of p
roblems of transport in random media. By extending the large deviations ap
proach for a continuous time random walk\, we uncover a general universal
behavior for the decay of the density [1]. It is found that fluctuations i
n the number of steps of the random walker\, performed at finite time\, le
ad to exponential decay (with logarithmic corrections) of $P(X\, t)$. This
universal behavior also holds for short times\, a fact that makes experim
ental observations readily achievable. Time permitting we then formulate t
he hitchhiker model where interacting molecules form aggregates\, that lea
d to fluctuations in the diffusion field\, and a many body mechanism for t
he exponential tails [2].\n\nReferences\n[1] E. Barkai and Stas Burov\, Pa
ckets of diffusing particles exhibit universal exponential tails\, Phys. R
ev. Lett. **124**\, 060603 (2020).\n[2] M. Hidalgo-Soria\, and E. Barkai\,
The Hitchhiker model for Laplace diffusion processes in the cell environm
ent\, Phys. Rev. E **102**\, 012109 (2020).\n\nhttps://zakopane.if.uj.edu
.pl/event/16/contributions/363/
URL:https://zakopane.if.uj.edu.pl/event/16/contributions/363/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Generalised ‘Arcsine’ laws for run-and-tumble particle in one
dimension
DTSTART;VALUE=DATE-TIME:20201203T172400Z
DTEND;VALUE=DATE-TIME:20201203T172500Z
DTSTAMP;VALUE=DATE-TIME:20230209T100500Z
UID:indico-contribution-421@zakopane.if.uj.edu.pl
DESCRIPTION:Speakers: Prashant Singh (ICTS-TIFR)\, Anupam Kundu (ICTS-TIFR
)\n\nThe ‘Arcsine’ laws of Brownian particles in one dimension describ
e\ndistributions of three quantities: the time $t_m$ to reach maximum posi
tion\, the\ntime $t_r$ spent on the positive side and the time $t_l$ of th
e last visit to the\norigin. Interestingly\, the cumulative distribution o
f all three quantities are the\nsame and given by Arcsine function. In thi
s paper\, we study distribution of\nthese three times $t_m$\, $t_r$ and $t
_l$ in the context of single run-and-tumble particle\nin one dimension\, w
hich is a simple non-Markovian process. We compute\nexact distributions of
these three quantities for arbitrary time and find that\nall three distri
butions have a delta function part and a non-delta function\npart. Interes
tingly\, we find that the distributions of $t_m$ and tr are identical\n(re
miniscent of the Brownian particle case) when the initial velocities of th
e\nparticle are chosen with equal probability. On the other hand\, for $t_
l$\, only\nthe non-delta function part is the same as the other two. In ad
dition\, we find\nexplicit expressions of the joint distributions of the m
aximum displacement\nand the time at which this maxima occurs.\n\nhttps://
zakopane.if.uj.edu.pl/event/16/contributions/421/
URL:https://zakopane.if.uj.edu.pl/event/16/contributions/421/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Detection of interaction and energy exchange with invisible partne
rs in localized Brownian dumbbells
DTSTART;VALUE=DATE-TIME:20201203T170000Z
DTEND;VALUE=DATE-TIME:20201203T170100Z
DTSTAMP;VALUE=DATE-TIME:20230209T100500Z
UID:indico-contribution-404@zakopane.if.uj.edu.pl
DESCRIPTION:Speakers: Alexander S. Serov (Decision and Bayesian Computatio
n\, Department of Computational Biology\, Department of Neurosciences\, CN
RS USR 3756\, CNRS UMR 3571\, Institut Pasteur\, 25 rue du Docteur Roux\,
Paris\, 75015\, France)\, Jean-Baptiste Masson (Decision and Bayesian Comp
utation\, Department of Computational Biology\, Department of Neuroscience
s\, CNRS USR 3756\, CNRS UMR 3571\, Institut Pasteur\, 25 rue du Docteur R
oux\, Paris\, 75015\, France)\, Christian L. Vestergaard (Decision and Bay
esian Computation\, Department of Computational Biology\, Department of Ne
urosciences\, CNRS USR 3756\, CNRS UMR 3571\, Institut Pasteur\, 25 rue du
Docteur Roux\, Paris\, 75015\, France)\n\nWhen recording trajectories of
biomolecules in crowded media\, a question of fundamental interest is whet
her a tracked molecule interacts with other molecules or structures invisi
ble to the observer. One also wants to know whether energy exchange occurs
during such interactions since out-of-equilibrium interactions can be a s
ign of a specific biological function. Addressing these questions using re
corded single-particle trajectories is\, in general\, an ill-posed problem
. In this work\, we demonstrate how and when possible interactions and ene
rgy transfer between the particles can be detected in an idealized system
consisting of two linked localized Brownian particles\, where only one of
the two trajectories is recorded.\n\nTo these means\, we designed a Bayesi
an test for whether the observed trajectory corresponds to a single partic
le or 2 linked particles. The test leverages Bayesian statistics to compar
e the evidence for that the input trajectory’s power spectrum is generat
ed by an independent particle or a particle with a partner. Extensive nume
rical simulations allowed us to establish parameter regions\, within which
such partner detection is possible. As expected\, the test is most sensit
ive to the link strength and the ratio of particle diffusivities. As a byp
roduct\, we also obtained estimates of the localization strength and diffu
sivities of both particles.\n\nFor systems where a difference in diffusivi
ties can be interpreted as a difference in local temperatures\, we further
extended our approach to determine whether the physical system is out of
equilibrium. Using numerical simulations\, we identified the parameter ran
ge where the distinction can be reliably made from recorded data.\n\nDespi
te the simplicity of the model\, the application of the method to real exp
erimental trajectories may help identify the presence of an interaction pa
rtner\, the interaction direction\, and the presence of potential energy f
luxes.\n\nhttps://zakopane.if.uj.edu.pl/event/16/contributions/404/
URL:https://zakopane.if.uj.edu.pl/event/16/contributions/404/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Statistical physics of inhomogeneous transport equations: first pa
ssage to the space-dependent diffusion
DTSTART;VALUE=DATE-TIME:20201203T170100Z
DTEND;VALUE=DATE-TIME:20201203T170200Z
DTSTAMP;VALUE=DATE-TIME:20230209T100500Z
UID:indico-contribution-409@zakopane.if.uj.edu.pl
DESCRIPTION:Speakers: Muhammad Nawaz Qaisrani (International School for Ad
vanced Studies\, The Abdus Salam International Centre for Theoretical Phys
ics)\, Ali Hassanali (The Abdus Salam International Centre for Theoretical
Physics)\, Roman Belousov (The Abdus Salam International Centre for Theor
etical Physics)\, Ricardo Franklin Mergarejo (The Abdus Salam Internationa
l Centre for Theoretical Physics)\, Edgar Roldán (The Abdus Salam Interna
tional Centre for Theoretical Physics)\n\nAs the science and modern techno
logies are seizing the realm of nanoscale systems\, characterization of co
mposite materials with solid-fluid and fluid-fluid interfaces has become a
problem of broad interdisciplinary interest. Properties of such complex s
ystems\, which vary in space over microscopic scales\, shape important pro
cesses in engineering and biology. Estimation of the inhomogeneous—space
-dependent—transport coefficients that characterize these processes\, e.
g. the diffusion coefficient or the heat conductivity\, is however a chall
enging task. Moreover\, two alternative formulations of the inhomogeneous
transport equations exist in the literature. Using the theory of statistic
al physics\, in my talk I will show that the two formulations\, often rega
rded as distinct models\, are in fact equivalent. In particular\, one of t
hem conveniently links the mass diffusion equation with statistics of mole
cules' first-passage events\, which provide an efficient inference techniq
ue for the space-dependent diffusion coefficient.\n\nhttps://zakopane.if.u
j.edu.pl/event/16/contributions/409/
URL:https://zakopane.if.uj.edu.pl/event/16/contributions/409/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Express your scientific track record in just three numbers
DTSTART;VALUE=DATE-TIME:20201203T172500Z
DTEND;VALUE=DATE-TIME:20201203T172600Z
DTSTAMP;VALUE=DATE-TIME:20230209T100500Z
UID:indico-contribution-422@zakopane.if.uj.edu.pl
DESCRIPTION:Speakers: Barbara Żogała-Siudem (Systems Research Institute\
, Polish Academy of Sciences)\, Anna Cena (Warsaw University of Technology
)\, Marek Gagolewski (Deakin Universtiy)\, Grzegorz Siudem (Warsaw Univers
ity of Technology)\n\nThe growing popularity of bibliometric indexes goes
hand in hand with their critique by those who claim that scientist’s imp
act cannot be reduced to a single number. Some even believe that such a co
mplex reality fails to submit to any quantitative description. We argue th
at neither of the two controversial extremes is true. With our new agent-b
ased model (doi.org/10.1073/pnas.2001064117) we can describe the emergenc
e of citation curves very accurately. \n\nIn the model we assumed that so
me citations are distributed according to the rich get richer rule while s
ome others are allocated totally at random. This yields a very accurate mo
del that is governed by merely three easily interpretable parameters: prod
uctivity\, total impact\, and rho\, which measures preferential vs. random
rules ratio..\n\nhttps://zakopane.if.uj.edu.pl/event/16/contributions/422
/
URL:https://zakopane.if.uj.edu.pl/event/16/contributions/422/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Kramers-like problem for underdamped Levy flights
DTSTART;VALUE=DATE-TIME:20201203T170200Z
DTEND;VALUE=DATE-TIME:20201203T170300Z
DTSTAMP;VALUE=DATE-TIME:20230209T100500Z
UID:indico-contribution-416@zakopane.if.uj.edu.pl
DESCRIPTION:Speakers: Karol Capała (Institute of Theoretical Physics\, Ja
giellonian University)\, Bartłomiej Dybiec (Institute of Theoretical Phys
ics\, Jagiellonian University)\n\nThe noise driven motion in a bistable po
tential acts as the archetypal model of various physical phenomena. In th
e weak noise limit\, for the overdamped particle driven by a non-equilibri
um\, $\\alpha$-stable noise the ratio of forward and backward transition
rates depends only on the width of the potential barrier separating both m
inima. The poster presents analytical and numerical results showing that i
n the regime of full dynamics the ratio of transition rates depends both o
n widths and heights of the potential barrier separating minima of the do
uble-well potential.\n\n\nK. Capała and B. Dybiec\, *Underdamped\, anomal
ous kinetics in double-well potentials*\, Phys. Rev. E **102**\, 052123 (2
020).\n\nhttps://zakopane.if.uj.edu.pl/event/16/contributions/416/
URL:https://zakopane.if.uj.edu.pl/event/16/contributions/416/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Photoluminescence of Complex Systems
DTSTART;VALUE=DATE-TIME:20201203T170500Z
DTEND;VALUE=DATE-TIME:20201203T170600Z
DTSTAMP;VALUE=DATE-TIME:20230209T100500Z
UID:indico-contribution-380@zakopane.if.uj.edu.pl
DESCRIPTION:Speakers: Ambra Lattanzi (Institute of Nuclear Physics IFJ-PAN
\, Krakòw\, Poland - ENEA FSN-FUSPHYS-TSM\, Frascati (Rome)\, Italy)\, Gi
useppe Dattoli (ENEA FSN-FUSPHYS-TSM\, Frascati (Rome)\, Italy)\, Giuseppe
Baldacchini\n\nThe photoluminescence degradation of the thermally evapora
ted Alq3 thin films can be described by a four components model based on t
he Kohlrausch-Williams-Watt (KWW) function. This model improved the agreem
ent between experimental data and the theoretical fit with respect to the
four components model based on “pure” exponential functions. In fact\,
the negative bump in PL intensity decay observed in the reference not-ann
ealed sample is perfectly fitted\, and the last part of the time resolved
spectroscopy improved its adherence to experimental data both in annealed
and not-annealed samples.\nA material frame of reference has been introduc
ed in order to investigate the physical nature of the KWW function in rela
xation processes and at the same time\, explain the peculiar experimental
features emerged in the time-spectral PL behaviour. The introduction of a
nonlinear time variable\, named material clock or material time\, overcome
s the difficulties carried by the anomalous behaviour considering the proc
ess from a bare point of view: the relaxation behaves ideally whereas the
material frame of reference is going to be stretched or compressed. This a
llows to model the PL degradation dynamics as a damped harmonic oscillator
. Once the physics has been understood\, it is possible to restore the lab
oratory frame of reference and define the reduced mass\, a time-depending
function that unlocks the physical meaning of the experimental peculiariti
es observed in the PL emission. \nThe results are framed in the context o
f physical-chemical reactions in order to emphasize how the KWW function i
s a sum of sub-processes. The physical meaning of these sub-processes can
be related to internal and environmental agents interactions under defined
physical conditions. These insights highlight the usefulness of the prope
r mathematical procedures and properties\, such as the monotonicity and th
e complete monotonicity\, for investigating the PL emission of this organo
metallic molecule. Moreover\, this method is also promising for describing
the photoluminescent processes of similar organic molecules both for basi
c research and optoelectronic applications.\n\nhttps://zakopane.if.uj.edu.
pl/event/16/contributions/380/
URL:https://zakopane.if.uj.edu.pl/event/16/contributions/380/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Nanoscale Lubrication in Model Biosystems as Rationalized in Terms
of Fractons and Spectral-Mechanical Properties of Networked Biopolymers i
n Solutions
DTSTART;VALUE=DATE-TIME:20201203T172600Z
DTEND;VALUE=DATE-TIME:20201203T172700Z
DTSTAMP;VALUE=DATE-TIME:20230209T100500Z
UID:indico-contribution-423@zakopane.if.uj.edu.pl
DESCRIPTION:Speakers: ADAM GADOMSKI (UTP UNIVERSITY OF SCIENCE &\; TECH
NOLOGY BYDGOSZCZ\, POLAND)\, Piotr Bełdowski (Institute of Mathematics an
d Physics\, Faculty of Chemical Technology and Engineering\, UTP Universi
ty of Science and Technology\, Bydgoszcz\, Poland)\n\nA concept of a biopo
limer network immersed within an aqueous solution as addressed in terms of
flexibility vs. mechanical stability criterion has been proposed. It is
based on a transmission of correlated wave of (hydrogen) ions emerging fro
m breaking in a massive way the hydrogen bonds between the biopolymers\, s
uch as hyaluronan\, and their non-ideal aqueous solution’s surroundings.
\nBased on the argumentation presented in a paper by Reuveni et al. [1] i
t has been demonstrated that there exists a clear connection between the l
n(N) (a natural logarithm of the biopolymer length N) and an inverse of a
difference between two major contributions of this Landau-Peierls instabil
ity type paradigm. Providing that the so-called Alexander-Orbach conjectur
e for the oscillating biopolymeric system applies [2\,3] one of the contri
butions is of mechanical nature\, with an exponent g represented by 1/(2-3
g) whereas the other appears to be a surface-to-volume characteristic expo
nent\, attaining preferentially a value of ca. 2/3 for a three-dimensiona
l adjacent (articulating) space. \nIt has been shown in a numerical way th
at for N of the order of milion(s) biopolymer’s residues\, for example f
or hyaluronan equivalent to its molecular weight of 10^6-6x10^6 Daltons\,
a measure of the best viscoelastic efficiency for the hyaluronan\, there e
xists an equality ln(N) = b/[1/(2-3g) – 2/3] that\, for example\, for N=
10^6 gives the value of mechanical exponent g close to 1/3\, yielding acco
rding to [3\,4]\, an excellent passage of the (hydrogen) ions’ wave deri
ved from a breakage of the adjacent hydrogen bonds in the biopolymer-solut
ion system of interest\, provided that the constant b\, according to [1]\,
can be taken at b=4.5. (In general\, for the exponent g > 1/6 holds.) The
first results seem to be promising when thoroughly rationalizing nanoscal
e friction-lubrication properties of biopolymer-solution articulating/conf
ined subspaces exposed to very small nano-Newton loading conditions. For a
nother thermomechanical scenario describing phase-transition and relaxatio
n kinetics of a biopolymeric system\, see [5]. \nReferences\n[1] S. Reuven
i et al. PRL 100\, 208101 (2008). \n[2] S. Alexander\, R. Orbach J. Physiq
ue-LETTRES 43\, L-625 (1982). \n[3] A. Gadomski et al. Tribol. Lett. 30\,
83 (2008). \n[4] A. Gadomski et al. Mathematical Biosciences 244\, 188 (2
013) . \n[5] A. Gadomski\, J. Łuczka\, Acta Phys. Pol. B 28\, 1827 (1997)
\; A. Gadomski et al. Europ. Phys. J. B 91\, 237 (2018). \n\nEmail address
: agad@utp.edu.pl (to whom the correspondence can be addressed).\n\nhttps:
//zakopane.if.uj.edu.pl/event/16/contributions/423/
URL:https://zakopane.if.uj.edu.pl/event/16/contributions/423/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The effect of substrate roughness on random sequential adsorption
packing properties
DTSTART;VALUE=DATE-TIME:20201203T172600Z
DTEND;VALUE=DATE-TIME:20201203T172700Z
DTSTAMP;VALUE=DATE-TIME:20230209T100500Z
UID:indico-contribution-424@zakopane.if.uj.edu.pl
DESCRIPTION:Speakers: Piotr Kubala (Institute of Theoretical Physics\, Jag
iellonian University)\, Michal Ciesla (Institute of Theoretical Physics\,
Jagiellonian University)\n\nAdsorption on smooth and atomistically flat su
rface is well understood\, while still very few works concern adsorption o
n rough and heterogeneous surfaces. In this study\, we investigate the pro
perties of packings of balls obtained via random sequential adsorption (RS
A) on a sinusoidal substrate. Our main goal is to observe surface inhomoge
neities on a scale smaller than particles' size. We study how various char
acteristics\, such as packing fraction\, packing growth kinetics\, availab
le surface function and 2-particle density correlation function depend on
the wavenumber and the amplitude of a sine-wave-shaped surface. These quan
tities indeed allow us to discern very minute surface impurities from the
packing alone.\n\nhttps://zakopane.if.uj.edu.pl/event/16/contributions/424
/
URL:https://zakopane.if.uj.edu.pl/event/16/contributions/424/
END:VEVENT
BEGIN:VEVENT
SUMMARY:On zero-delay synchronization in a network of timed automata model
ing cardiac tissue
DTSTART;VALUE=DATE-TIME:20201204T153000Z
DTEND;VALUE=DATE-TIME:20201204T160000Z
DTSTAMP;VALUE=DATE-TIME:20230209T100500Z
UID:indico-contribution-368@zakopane.if.uj.edu.pl
DESCRIPTION:Speakers: Danuta Makowiec (Institute of Theoretical Physics\,
University of Gdańsk)\n\nA network of timed automata (NTA)\, inspired by
Greenberg-Hastings cellular automata\, can efficiently and faithfully refl
ects the work of the real pacemaker [1]. In this system\, each automaton
cyclically switches between three states of a certain length of time: from
$F$ firing state of length $f$\, to $R$ refractory state of length $r$
and then to $A$ activity state of length $a$\, what closely follows the
phenomenologically known oscillations of myocytes. As a results of inter
actions between neighboring cells\, the self-organization of the oscillati
ng units to a common oscillation emerges which then leads to forming a sig
nal of initiating a contraction of the whole heart. Thus NTA establishe
s an appropriate platform to model a natural human pacemaker\, in which we
gain insight into conditions and stages of the synchronization process [2
].\n\nThe visible effect of synchronization in NTA is the excitation wave\
, i.e. the emergence of steady move of a cluster formed by automata stayin
g in $F$ state.\nThe synchronization can be of frequency locking type\, wh
en some automata force the neighboring automata to faster switch the state
$A$ to $F$ than it is expected by intrinsic automaton's cycle\, or of pha
se-locking type\, when neighboring automata exhibit the common difference
in oscillatory phase. Thus\, the frequency-locking synchronizations result
in the fast rhythms. The visible effect of such synchronization is a spir
al origin of the excitation wave. The phase-locking synchronization occur
s when neighboring automata are one step late in the advancement of the c
yclic transitions of intrinsic time periods. A visible effect of such sync
hronization is propagation of the excitation wave with rhythm comparable t
o the period of oscillating automata.\n\nThe strength of synchronization i
s due to the reduction of uncorrelated degrees of freedom to a collective
mode of operation\, which then enables the long-term ordering and coordin
ation of biological processes\n\nThe emergence of zero-delay phase-locking
synchronization\, the marching squad synchronization\, has been observe
d in NTA when in response to the $F$ state of neighbors\, the length of th
e refractory phase $r$ was increased [1]. \nOn the other hand\, in NTA sy
stem in which the vagal regulation was modeled as increase in the length $
a$ of the activity state in response to the vagal activity\, such synchro
nization is also observed but only when the activity of vagal system oft
en changes [2].\nThe mechanisms behind synchronizing without any delay in
spatially distributed systems are not clear and debated. The presentation
will be devoted to analyze possible mechanisms leading to the marching s
quad synchronization in the NTA system modeling the pacemaker.\n\n\n[1] D.
Makowiec "Pacemeaker rhythm through networks of pacemaker automata - a re
view" Acta Physica Polonica B Proceedings Supplement\, 7(2014) 347\n[2] D.
Makowiec\, W. Miklaszewski\, J. Wdowczyk\, A. Lawniczak "From cellular au
tomata model of vagal control of human right atrium to heart beats pattern
s" Physica D\, to appear\, (2020)\n\nhttps://zakopane.if.uj.edu.pl/event/1
6/contributions/368/
URL:https://zakopane.if.uj.edu.pl/event/16/contributions/368/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Opening
DTSTART;VALUE=DATE-TIME:20201203T075000Z
DTEND;VALUE=DATE-TIME:20201203T080000Z
DTSTAMP;VALUE=DATE-TIME:20230209T100500Z
UID:indico-contribution-411@zakopane.if.uj.edu.pl
DESCRIPTION:https://zakopane.if.uj.edu.pl/event/16/contributions/411/
URL:https://zakopane.if.uj.edu.pl/event/16/contributions/411/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Phase transitions in the q-voter model with generalized anticonfor
mity
DTSTART;VALUE=DATE-TIME:20201203T171200Z
DTEND;VALUE=DATE-TIME:20201203T171300Z
DTSTAMP;VALUE=DATE-TIME:20230209T100500Z
UID:indico-contribution-376@zakopane.if.uj.edu.pl
DESCRIPTION:Speakers: Jakub Pawłowski (Wroclaw University of Science and
Technology)\, Angelika Abramiuk-Szurlej (Wroclaw University of Science and
Technology)\, Katarzyna Sznajd-Weron (Wroclaw University of Science and T
echnology)\n\nRecent empirical studies provide evidence that so-called soc
ial hysteresis [1] is present in animal [1\, 2\, 3] as well as in human so
cieties [4\, 5\, 6]\, which would suggest that (at least some) phase trans
itions observed in real social systems are discontinuous. It occurs that d
iscontinuous phase transitions are not that typical in models of opinion d
ynamics. Within several versions of the $q$-voter model [7]\, belonging to
the class of the binary-state dynamics [8\, 9]\, only continuous phase tr
ansitions has been observed\, including the original $q$-voter model [10]
or the $q$-voter model with anticonformity [11]. However\, the change of t
ransition from continuous to discontinuous (for $q>5$) has been reported f
or the $q$-voter model with independence [11].\n\nIn [12] we introduce a $
q$-voter model with generalized anticonformity. Previously it was assumed
that the size of the unanimous group of influence needed for both conformi
ty and anticonformity is equal [11]. We abandon this unjustified assumptio
n and introduce a generalized model\, in which the size of the influence g
roup needed for conformity $q_c$ and the size of the group needed for anti
conformity $q_a$ are independent variables and in general $q_c \\neq q_a$.
\n\nWe consider a system of $N$ voters that form vertexes of an arbitrary
network. Each of them is characterized by the dynamical binary variable $S
_i(t) = \\pm 1$\, $i = 1$\, $\\ldots$\, $N$ which\, in case of social syst
ems\, can be interpreted as an opinion on a given subject (yes/no\, agree/
disagree) at a given time $t$. In each elementary time step we randomly ch
oose one agent that will reconsider its opinion. With probability $p$ the
chosen voter behaves like an anticonformist\, whereas with complementary p
robability $1 - p$ like a conformist. In any case we randomly choose a gro
up of influence from the nearest neighbours of the agent without repetitio
ns. The size of the group depends on the voter's response to social pressu
re ($q_a$ for anticonformity\, $q_c$ for conformity). For $q_a = q_c = q$
the model reduces to the original $q$-voter model with anticonformity intr
oduced in [11]. If the group of influence is unanimous\, the voter is infl
uenced by the group and adapts to it (in case of conformity) or rebels aga
inst it (in case of anticonformity).\n\nWe analyse the model on a complete
graph using linear stability analysis\, numerical methods and Landau's th
eory. We calculate the analytical formulas for the lower spinodal and the
tricritical point for which the phase transition changes from continuous t
o discontinuous. It has occurred that the generalized model displays both
continuous and discontinuous phase transitions depending on the sizes of t
he groups of influence needed for conformity $q_c$ and anticonformity $q_a
$. If the parameter $q_c$ is sufficiently larger than $q_a$\, the type of
the phase transition changes to discontinuous.\n\n[1] Doering\, G.N.\, Sch
arf\, I.\, Moeller\, H.V.\, Pruitt\, J.N. *Social tipping points in animal
societies in response to heat stress*. Nature Ecology and Evolution\, 2(8
):1298-1305\, (2018)\n[2] Beekman\, M.\, Sumpter\, D.J.T.\, Ratnieks\, F.L
.W. *Phase transition between disordered and ordered foraging in pharaoh's
ants*. Proceedings of the National Academy of Sciences of the United Stat
es of America\, 98(17):9703-9706\, (2001)\n[3] Pruitt\, J.N.\, Berdahl\, A
.\, Riehl\, C.\, Pinter-Wollman\, N. and Moeller\, H.V.\, Pringle\, E.G.\,
Aplin\, L.M.\, Robinson\, E.J.H.\, Grilli\, J.\, Yeh\, P.\, Savage\, V.M.
\, Price\, M.H.\, Garland\, J.\, Gilby\, I.C.\, Crofoot\, M.C.\, Doering\,
G.N.\, Hobson\, E.A. *Social tipping points in animal societies*. Proceed
ings of the Royal Society B: Biological Sciences\, 285(1887):20181282\, (2
018)\n[4] Clark\, A.E. *Unemployment as a Social Norm: Psychological Evide
nce from Panel Data*. Journal of Labor Economics\, 21(2):323-351\, (2003)\
n[5] Elster\, J. *A Note on Hysteresis in the Social Sciences*. Synthese\,
33(2/4):371-391\, (1976)\n[6] Scheffer\, M.\, Westley\, F.\, Brock\, W. *
Slow response of societies to new problems: Causes and costs*. Ecosystems\
, 6(5):493-502\, (2003)\n[7] Castellano\, C.\, Muñoz\, M.A.\, Pastor-Sato
rras\, R. *Nonlinear q-voter model*. Physical Review E\, 80(4):041129\, (2
009)\n[8] Gleeson\, J.P. *Binary-state dynamics on complex networks: Pair
approximation and beyond*. 3(2):021004\, (2013)\n[9] Jędrzejewski\, A.\,
Sznajd-Weron\, K. *Statistical Physics Of Opinion Formation: is it a SPOOF
?* Comptes Rendus Physique\, 20(4):244-261\, (2019)\n[10] Castellano\, C.\
, Fortunato\, S.\, Loreto\, V. *Statistical physics of social dynamics*. R
eviews of Modern Physics\, 81(2):591-646\, (2009)\n[11] Nyczka\, P.\, Szna
jd-Weron\, K.\, Cisło\, J. *Phase transitions in the q-voter model with t
wo types of stochastic driving*. 86(1):011105\, (2012)\n[12] Abramiuk\, A.
\, Pawłowski\, J.\, Sznajd-Weron\, K. *Is Independence Necessary for a Di
scontinuous Phase Transition within the q-Voter Model?* Entropy\, 21:521\,
(2019)\n\nhttps://zakopane.if.uj.edu.pl/event/16/contributions/376/
URL:https://zakopane.if.uj.edu.pl/event/16/contributions/376/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Confined random motion: What is statistics? Gaussian or Laplacian?
DTSTART;VALUE=DATE-TIME:20201203T121000Z
DTEND;VALUE=DATE-TIME:20201203T123000Z
DTSTAMP;VALUE=DATE-TIME:20230209T100500Z
UID:indico-contribution-397@zakopane.if.uj.edu.pl
DESCRIPTION:Speakers: Aleksander Stanislavsky\n\nIn biophysics\, the singl
e-particle tracking (SPT) is broadly used to quantify the kinetics of fluo
rescently-labelled molecules/proteins in live cells. This powerful tool in
microscopy permits ones to resolve modes of motion of individual molecule
s for better understanding their role in such systems. The motion is not l
imited to pure (Brownian motion) diffusion\, but directed\, confined\, ano
malous diffusion are observed too. The study of their effects in live cell
s is of great interest.\n Based on strict analytical calculations and
simulations\, we show that the confined motion in presence of Brownian mo
tion in complex systems may have two different statistics . One of them ha
s the normal distribution\, whereas another\, surprisingly\, is under the
Laplace distribution with fatter tails than the normal case (with thin tai
ls always). Using the experimental data obtained from a recent SPT study o
n two particle types\, G-protein coupled receptors and the G proteins with
which the receptors interact\, we have detected the normal and Laplace co
nfinements. It is interesting that the contribution of the Laplace confine
ment is different for G proteins and receptors.\n The results are an
important step to experimental cell probing and paves the way for a new st
rategy acting on the processes occurring in live cells through changing th
e confined motion of molecules into live cells\, for example\, by drugs. T
his analytic treatment can be used for different models\, thus opening a n
ew direction towards understanding the role of confinement in complex syst
ems.\n\nhttps://zakopane.if.uj.edu.pl/event/16/contributions/397/
URL:https://zakopane.if.uj.edu.pl/event/16/contributions/397/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Optimization and Growth in First-Passage Resetting
DTSTART;VALUE=DATE-TIME:20201203T150000Z
DTEND;VALUE=DATE-TIME:20201203T153000Z
DTSTAMP;VALUE=DATE-TIME:20230209T100500Z
UID:indico-contribution-366@zakopane.if.uj.edu.pl
DESCRIPTION:Speakers: Sidney Redner (Santa Fe Institute)\, Benjamin De Br
uyne (Perimeter Institute of Theoretical Physics)\, Julien Randon-Furling
(Université Paris 1 Panthéon Sorbonne)\n\nWe combine resetting and first
-passage to define "first-passage resetting”\, where a random walk is re
set to a fixed position due to a first-passage event of the walk itself.
On the infinite half-line\, first-passage resetting of isotropic diffusion
is non-stationary\, in which the number of resetting events grows with ti
me as $t^{1/2}$. We calculate the resulting spatial probability distribut
ion of the particle\, and also obtain this distribution by a path decompos
ition approach. In a finite interval\, we define an first-passage-resettin
g optimization problem that is motivated by reliability theory. Here\, th
e goal is to operate a mechanical system close to its maximum capacity wit
hout experiencing too many breakdowns. When a breakdown occurs\, the syst
em is reset to its minimal operating point. We define and optimize an obje
ctive function that maximizes the reward (being close to maximum operation
) minus a penalty for each breakdown. Finally\, we study a first-passage-
driven domain growth dynamics in which its boundary recedes by a specified
amount when a diffusing particle reaches the boundary\, after which reset
ting occurs. We find a wide range of dynamical behaviors for the domain gr
owth rate in the interval and the semi-infinite line.\n\nhttps://zakopane.
if.uj.edu.pl/event/16/contributions/366/
URL:https://zakopane.if.uj.edu.pl/event/16/contributions/366/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Lévy Noise\, Time-Reversal Symmetry\, Nonequilibrium Stochastic T
hermodynamics\, and Bak’s Sandpile
DTSTART;VALUE=DATE-TIME:20201203T160000Z
DTEND;VALUE=DATE-TIME:20201203T162000Z
DTSTAMP;VALUE=DATE-TIME:20230209T100500Z
UID:indico-contribution-425@zakopane.if.uj.edu.pl
DESCRIPTION:Speakers: Martin Bier (East Carolina University)\, Steven Yuva
n (East Carolina University)\n\nThe Brownian noise in nonequilibrium syste
ms commonly contains more outliers. In that case the noise is best describ
ed with a Levy distribution. Many systems in which there are fluctuations
around a steady-state throughput can be modeled as a Levy-noise-subjected
particle in a parabolic potential. We consider an overdamped Brownian part
icle in a parabolic potential. If the noise is Levy\, time-reversal symmet
ry for the particle's trajectory is violated. We formulate a parameter\, r
\, to express and detect this violation. With solar flare data it is shown
how r can be readily obtained and next used to obtain a good estimate of
the stability index\, α\, of the underlying noise. Self-organized-critica
lity\, i.e. the famous avalanching sandpiles of Per Bak et al\, can also b
e modeled with a Levy-noise-subjected particle on a potential. Preliminary
results from such an approach are shown.\n\nhttps://zakopane.if.uj.edu.pl
/event/16/contributions/425/
URL:https://zakopane.if.uj.edu.pl/event/16/contributions/425/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Spectral content of a single trajectory
DTSTART;VALUE=DATE-TIME:20201203T093000Z
DTEND;VALUE=DATE-TIME:20201203T100000Z
DTSTAMP;VALUE=DATE-TIME:20230209T100500Z
UID:indico-contribution-367@zakopane.if.uj.edu.pl
DESCRIPTION:Speakers: Gleb Oshanin (Theoretical Condensed Matter\, Sorbonn
e Universités / CNRS)\n\nIn this presentation I will overview a recent pr
ogress in the theoretical\, numerical and experimental analyses of spectra
l densities of individual random trajectories of a finite length. On examp
le of a broad class of anomalous diffusions - the so-called fractional Bro
wnian motion\, I will demonstrate that one may calculate analytically the
full probability density function of such random functionals\, parametrise
d by a frequency and a finite observation time\, and extract a very meanin
gful information on the evolution of a process under study. In particular\
, I will show that the large frequency behaviour of the coefficient of var
iation of this distribution provides a robust criterion of anomalous diffu
sion\, which analytical prediction is validated by a comparison with exper
iments on dynamics in live cells and in agarose hydrogels\, and also by ex
tensive numerical simulations. If time permits\, I will also discuss the
peculiarities of spectra in out-of-equilibrium systems\, as exemplified b
y a Brownian Gyrator model\, and also of the so-called active Brownian mot
ion.\n\nhttps://zakopane.if.uj.edu.pl/event/16/contributions/367/
URL:https://zakopane.if.uj.edu.pl/event/16/contributions/367/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Numerical solution of temperature-dependent Smoluchowski equations
DTSTART;VALUE=DATE-TIME:20201203T171300Z
DTEND;VALUE=DATE-TIME:20201203T171400Z
DTSTAMP;VALUE=DATE-TIME:20230209T100500Z
UID:indico-contribution-377@zakopane.if.uj.edu.pl
DESCRIPTION:Speakers: Alexander Osinsky (Skolkovo Institute of Science and
Technology)\, Nikolai Brilliantov (Skolkovo Institute of Science and Tech
nology)\n\nIn this talk\, we provide a numerical study of the recently dev
eloped generalised temperature-dependent Smoluchowski equations. To solve
the new complex system\, we adapt and improve the low-rank approach of sol
ving large ODE systems. This allows us to quickly find approximate solutio
ns for generalised systems of Smoluchowski equations even when the collisi
on kernels change during aggregation. Our results confirm the analytical p
redictions of the temperature-dependent scaling\, including analytically o
btained scaling parameters. We also use a special type of Monte-Carlo simu
lations (temperature-dependent Monte-Carlo) to plot a phase diagram for di
fferent values of aggregation probability. We observe both temperature dec
rease and temperature increase scaling\, as well as find more interesting
behaviours at small system times.\n\nhttps://zakopane.if.uj.edu.pl/event/1
6/contributions/377/
URL:https://zakopane.if.uj.edu.pl/event/16/contributions/377/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Geometrical Optics of Constrained Brownian Motion
DTSTART;VALUE=DATE-TIME:20201204T085000Z
DTEND;VALUE=DATE-TIME:20201204T091000Z
DTSTAMP;VALUE=DATE-TIME:20230209T100500Z
UID:indico-contribution-398@zakopane.if.uj.edu.pl
DESCRIPTION:Speakers: Baruch Meerson (Hebrew University of Jerusalem)\n\nT
he optimal fluctuation method — essentially geometrical optics — gives
a valuable insight into large deviations of constrained Brownian motion\,
and it achieves this purpose by simple means. I will illustrate these po
ints by revisiting the Airy distribution - the probability distribution of
the \narea under a Brownian excursion - and considering some additional s
tatistics of Brownian excursions. \n\nThe geometrical optics immediately g
ives the large-area tail of the Airy distribution. It also predicts the po
sition distribution of a Brownian excursion at an intermediate time\, cond
itioned on a large area. Finally\, it gives the area distribution on a su
b-interval of Brownian excursion. The last two distributions exhibit dynam
ical phase transitions which have a simple geometric origin.\n\nhttps://za
kopane.if.uj.edu.pl/event/16/contributions/398/
URL:https://zakopane.if.uj.edu.pl/event/16/contributions/398/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Loopy Lévy flights enhance tracer diffusion in active suspensions
DTSTART;VALUE=DATE-TIME:20201203T113000Z
DTEND;VALUE=DATE-TIME:20201203T115000Z
DTSTAMP;VALUE=DATE-TIME:20230209T100500Z
UID:indico-contribution-412@zakopane.if.uj.edu.pl
DESCRIPTION:Speakers: Andrea Cairoli\, Kiyoshi Kanazawa\, Tomohiko Sano\,
Adrian Baule\n\nBrownian motion is widely used as a model of diffusion in
equilibrium media throughout the physical\, chemical and biological scienc
es. However\, many real-world systems are intrinsically out of equilibrium
owing to energy-dissipating active processes underlying their mechanical
and dynamical features. The diffusion process followed by a passive tracer
in prototypical active media\, such as suspensions of active colloids or
swimming microorganisms\, differs considerably from Brownian motion\, as r
evealed by a greatly enhanced diffusion coefficient and non-Gaussian stati
stics of the tracer displacements. Although these characteristic features
have been extensively observed experimentally\, there is so far no compreh
ensive theory explaining how they emerge from the microscopic dynamics of
the system. Here we develop a theoretical framework to model the hydrodyna
mic interactions between the tracer and the active swimmers\, which show s
that the tracer follows a non-Markovian coloured Poisson process that acc
ounts for all empirical observations [1]. The theory predicts a long-lived
Lévy flight regime of the loopy tracer motion with a non-monotonic cross
over between two different power-law exponents. The duration of this regim
e can be tuned by the swimmer density\, suggesting that the optimal foragi
ng strategy of swimming microorganisms might depend crucially on their den
sity in order to exploit the Lévy flights of nutrients. Our framework can
be applied to address important theoretical questions\, such as the therm
odynamics of active systems\, and practical ones\, such as the interaction
of swimming microorganisms with nutrients and other small particles (for
example\, degraded plastic) and the design of artificial nanoscale machine
s.\n\n[1] K. Kanazawa\, T. Sano\, A. Cairoli\, A. Baule\; Nature 579\, 364
–367 (2020)\n\nhttps://zakopane.if.uj.edu.pl/event/16/contributions/412/
URL:https://zakopane.if.uj.edu.pl/event/16/contributions/412/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Combinatorial aspects of the scattering on the Dirac delta potenti
al
DTSTART;VALUE=DATE-TIME:20201203T171400Z
DTEND;VALUE=DATE-TIME:20201203T171500Z
DTSTAMP;VALUE=DATE-TIME:20230209T100500Z
UID:indico-contribution-379@zakopane.if.uj.edu.pl
DESCRIPTION:Speakers: Przemysław Nowak (Warsaw University of Technology\,
Faculty of Physics)\, Grzegorz Siudem (Warsaw University of Technology\,
Faculty of Physics)\n\nWe study a system where a particle scatter on the p
eriodic Dirac delta potential. The problem is canonical i.e. it is conside
red during typical quantum mechanics course. There are several approaches
to solve the Schrodinger equation for such a systems [1] [2]. However most
of solutions rely on different matrix method. We would like to introduce
new\, combinatorial method by writing system of recursive equations. Based
off this solution we write transmission and reflected coefficients of a w
ave functions of a particle\, which is the common way to describe Quantum
tunnelling. \nThe most interesting conclusion from the introduced techniqu
e: we reveal combinatorial structure of the typical quantum mechanics prob
lem and write transmission and reflected coefficients using binomial coeff
icients as the number of combinations with repetition.\n\n[1] Fatih Erman\
, Manuel Gadella\, and Haydar Uncu. On scattering from the one dimensional
multiple dirac delta potentials. European Journal of Physics\, 39\, 01 20
18\n[2] D. Kiang. Multiple Scattering by a Dirac Comb. American Journal of
Physics\, 42:785–787\, September 1974.\n\nhttps://zakopane.if.uj.edu.pl
/event/16/contributions/379/
URL:https://zakopane.if.uj.edu.pl/event/16/contributions/379/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Extreme-Value Statistics of Stochastic Transport Processes
DTSTART;VALUE=DATE-TIME:20201203T115000Z
DTEND;VALUE=DATE-TIME:20201203T121000Z
DTSTAMP;VALUE=DATE-TIME:20230209T100500Z
UID:indico-contribution-391@zakopane.if.uj.edu.pl
DESCRIPTION:Speakers: Edgar Roldan (Max Planck Institute for the Physics o
f Complex Systems)\, Alexandre Guillet\, Frank Jülicher\n\nWe derive exac
t expressions for the finite-time statistics of extrema (maximum and minim
um) of the spatial displacement and the fluctuating entropy flow of biased
random walks. Our approach captures key features of extreme events in mol
ecular motor motion along linear filaments. For one-dimensional biased ran
dom walks\, we derive exact results which tighten bounds for entropy produ
ction extrema obtained with martingale theory and reveal a symmetry betwee
n the distribution of the maxima and minima of entropy production. Further
more\, we show that the relaxation spectrum of the full generating functio
n\, and hence of any moment\, of the finite-time extrema distributions can
be written in terms of the Mar{\\v{c}}enko-Pastur distribution of random-
matrix theory. Using this result\, we obtain efficient estimates for the e
xtreme-value statistics of stochastic transport processes from the eigenva
lue distributions of suitable Wishart and Laguerre random matrices. We con
firm our results with numerical simulations of stochastic models of molecu
lar motors.\n\nhttps://zakopane.if.uj.edu.pl/event/16/contributions/391/
URL:https://zakopane.if.uj.edu.pl/event/16/contributions/391/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Diffusion-controlled reactions: Extension of time-dependent Smoluc
howski’s rate coefficient to reactions in media with relaxation
DTSTART;VALUE=DATE-TIME:20201203T171700Z
DTEND;VALUE=DATE-TIME:20201203T171800Z
DTSTAMP;VALUE=DATE-TIME:20230209T100500Z
UID:indico-contribution-382@zakopane.if.uj.edu.pl
DESCRIPTION:Speakers: Sergey Traytak (N.N. Semenov Federal Research Center
for Chemical Physics\, Russian Academy of Sciences)\n\nProcesses involvin
g Brownian motion of small reactants toward much larger static particles (
sinks) and subsequent trapping of these reactants by the sinks are very co
mmonly encountered in both nature and in artificial media. Theoretically t
hese processes are described by so-called trapping model of the irreversib
le bulk diffusion-controlled reactions. To avoid difficulties of classical
diffusion theory the hyperbolic diffusion approximation is often used [1\
, 2]. Within the scope of the telegrapher equation the density distributio
n of reactants $\\rho (r\, t)$ about a spherical sink of radius $R$ obey
s the initial boundary-value problem with Smoluchowski’s condition on th
e reaction surface [1]. The primary task for the theory of diffusion-contr
olled reactions is the calculation of the reaction rate coefficient:\n\\be
gin{equation}\nk\\left(t\\right) = k_S \\frac{R}{\\tau_d}\\int_0^t \\exp \
\left(-\\frac{t-\\zeta}{\\tau_d}\\right) \\left. \\frac{\\partial \\rho \\
left(r\,\\zeta\\right)}{\\partial r} \\right| _{r\\rightarrow R+} d\\zeta
. \n\\end{equation}\nHereafter $k_S=4\\pi RD$ is the Smoluchowski steady s
tate rate coefficient\; $\\tau_d $ and $D$ are the relaxation time for t
he gradients of density distribution of reactants and diffusion coefficien
t\, respectively. We solved the posed problem exactly and\, using expressi
on (\\ref{Tray1})\, for the time-dependent reaction rate coefficient obtai
ned\n\\begin{equation}\nk \\left(t\\right) = k_S \\left\\lbrace \\left[1-
{\\exp \\left(- \\frac{t}{\\tau_d} \\right)}\\right] + \\frac{R}{\\sqrt{\\
tau_d D}}\\left[ \\exp \\left( - \\frac{t}{2\\tau_d} \\right) I_0\\left(\\
frac{t}{2\\tau_d} \\right)-{\\exp \\left(- \\frac{t}{\\tau_d} \\right)} \\
right] \\right\\rbrace \,\n\\end{equation}\nwhere $I_0(z)$ is the first k
ind modified Bessel function of order zero. It is important to note that t
he last term in expression (1) was erroneously omitted in the relevant for
mula derived by Rice (see expression (289) in page 330 of book [1]). Formu
la (2) generalizes the classical Smoluchowski result to short time values\
, which is important for reactions occuring in media with relaxation [2].\
n\n[1] S. A. Rice\, Diffusion-limited reactions\, Amsterdam: Elsevier\, 19
85.\n[2] D. Jou\, J. Casas-Vazquez and G. Lebon\, Extended irreversible th
ermodynamics (Fourth Edition)\, Springer\, 2010.\n\nhttps://zakopane.if.uj
.edu.pl/event/16/contributions/382/
URL:https://zakopane.if.uj.edu.pl/event/16/contributions/382/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Steady oscillations in kinetic model of aggregation process with c
ollisional fragmentation
DTSTART;VALUE=DATE-TIME:20201203T171900Z
DTEND;VALUE=DATE-TIME:20201203T172000Z
DTSTAMP;VALUE=DATE-TIME:20230209T100500Z
UID:indico-contribution-372@zakopane.if.uj.edu.pl
DESCRIPTION:Speakers: Nikolai Brilliantov (Skolkovo Institute of Science a
nd Technology)\, Sergey Matveev (Skolkovo Institute of Science and Technol
ogy)\, Aleksei Kalinov (Skolkovo Institute of Science and Technology)\, Pa
vel Krapivsky (Boston University)\n\nIn this work\, we study a kinetic mod
el of aggregation process with collisional fragmentation with use of two e
fficient implementations of numerical methods: direct simulation Monte Car
lo and finite-difference scheme exploiting the low-rank matrix representat
ions of the utilized kinetic coefficients. We concentrate our efforts on t
he analysis of the solutions for a particular class of non-local aggregati
on kernels \n$$\nK_{i\,j} = i^a j^{-a} + i^{-a} j^{a}\,\n$$\nwith multipli
cative expression for the fragmentation rates $F_{i\,j} = \\lambda K_{i\,j
}$ with $0 < \\lambda \\ll 1$. For $a > 0.5$ and $\\lambda < \\lambda_{c}$
never-ending collective oscillations of the aggregates' concentrations ta
ke place[1].\n\nThe main contribution of this work is cross-validation of
our previous observations with the utilization of the well-known stochasti
c acceptance-rejection method [2] and its modification to an accounting of
the fragmentation events.\n\n[1] Brilliantov N. V.\, Otieno W.\, Matveev
S. A.\, Smirnov A. P.\, Tyrtyshnikov E. E.\, Krapivsky P. L. (2018) // Ste
ady oscillations in aggregation-fragmentation processes. Physical Review E
\, 98(1)\, 012109.\n[2] Garcia A. L.\, Van Den Broeck C.\, Aertsens M.\, S
erneels R. (1987) // A Monte Carlo simulation of coagulation. Physica A: S
tatistical Mechanics and its Applications\, 143(3)\, 535-546.\n\nhttps://z
akopane.if.uj.edu.pl/event/16/contributions/372/
URL:https://zakopane.if.uj.edu.pl/event/16/contributions/372/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The study of structure influence on diffusion across alginate memb
ranes filled with magnetite
DTSTART;VALUE=DATE-TIME:20201203T171600Z
DTEND;VALUE=DATE-TIME:20201203T171700Z
DTSTAMP;VALUE=DATE-TIME:20230209T100500Z
UID:indico-contribution-360@zakopane.if.uj.edu.pl
DESCRIPTION:Speakers: Michal Ciesla (Institute of Theoretical Physics\, Ja
giellonian University\, Kraków\, Poland)\, Anna Strzelewicz (Silesian Uni
versity of Technology)\, Monika Krasowska (Silesian University of Technolo
gy)\, Gabriela Dudek (Silesian University of Technology)\n\nThe combinatio
n of polymer and inorganic substance in hybrid membrane results in favoura
ble selectivity and permeability\, and consequently such membrane becomes
a promising alternative to conventional membrane materials. The resulting
membranes show improved chemical\, mechanical\, and thermal stability and
hydrophilic–hydrophobic balance. The objective of this research is to de
termine whether there is a relation between membrane morphology\, which is
characterized by different parameters\, and the diffusive transport in th
e membrane. We expect that different amount of magnetite particles in algi
nate matrix cross-linked by different agents influence on structure and mo
rphology properties and also affects the diffusion and transport propertie
s. In this work\, we investigate the morphology of cross-sections of the h
ybrid alginate membranes filled with various amount of magnetite $(Fe_3 O_
4)$ and crosslinked using four different agents: calcium chloride\, phosph
oric acid\, glutaraldehyde and citric acid. A key aspect of showing struct
ure - diffusion relationship can be the study of the simulation of particl
e motion in a membrane environment\, and in our case\, it is a simulation
of a random walk on the structures of hybrid alginate membranes. For a bet
ter understanding of the problem\, we model structures of two–dimensiona
l heterogenic membranes which resemble real structures and then simulate r
andom walk on them. The prototype structures of hybrid polymeric membranes
are created with the desired quantity\, size and distribution of obstacle
s\, which corresponds to the given amount of magnetite in the hybrid algin
ate membrane. Generated membranes possessing specific parameters are compa
rable to the real hybrid alginate membranes filled with magnetite and give
a real chance to find the relation between diffusion and structure proper
ties. This observation may support a better understanding of structure inf
luence on mass transport through polymer materials.\n\n[1] G. Dudek\, M. K
rasowska\, R. Turczyn\, M. Gnus\, A. Strzelewicz\, Structure\, morphology
and separation efficiency of hybrid Alg/$Fe_3O_4$ membranes in pervaporati
ve dehydration of ethanol\, Separation and Purification Technology 182 (20
17) 101–109\n[2] M. Krasowska\, A. Strzelewicz\, G. Dudek\, M. Cieśla\,
Structure-diffusion relationship of polymer membranes with different text
ure\, Physical Review E 95\, 012155 (2017)\n[3] A. Strzelewicz\, M. Krasow
ska\, G. Dudek\, M. Cieśla\, Design of polymer membrane morphology with p
rescribed structure and diffusion properties\, Chemical Physics\, 531\, 11
0662 ( 2020)\n\nhttps://zakopane.if.uj.edu.pl/event/16/contributions/360/
URL:https://zakopane.if.uj.edu.pl/event/16/contributions/360/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Spontaneous symmetry breaking of active phase in coevolving nonlin
ear voter model
DTSTART;VALUE=DATE-TIME:20201204T110000Z
DTEND;VALUE=DATE-TIME:20201204T112000Z
DTSTAMP;VALUE=DATE-TIME:20230209T100500Z
UID:indico-contribution-383@zakopane.if.uj.edu.pl
DESCRIPTION:Speakers: Joanna Toruniewska (Warsaw University of Technology)
\, Arkadiusz Jędrzejewski (Wrocław University of Science and Technology)
\, Oleg Zaikin (ITMO University)\, Janusz Hołyst (Warsaw University of Te
chnology)\, Krzysztof Suchecki (Warsaw University of Technology)\n\nA feed
back loop between the network topology and dynamical processes that occur
between nodes is common in real-world networks. The topology impacts the e
volution of node states\, which in turn influence the way the structure it
self is modified. This feedback is a signature of networks that are called
adaptive or coevolutionary. Adaptive networks are especially relevant for
social systems\, where they can model phenomena such as the emergence of
consensus and polarization\, opinion formation\, or group fragmentation. T
hese coevolutionary models rely on two basic mechanisms. One accounts for
the changes in the node states\, whereas the other for the link rewiring.
Both of them may be implemented in various ways. The voter model\, as a mi
nimalist model of opinion formation process\, provides the basis for the e
volution of state variables in many adaptive networks that represent socia
l interactions. Being analytically tractable\, it has played a fundamental
role in understanding the process of network fragmentation. This work ext
ends the study in this area by the analysis of one of the nonlinear extens
ions of the coevolving voter model.\n\nIn the analyzed model\, each node i
n the network represents a voter and can be in one of two states that corr
espond to different opinions shared by the voters. A voter disagreeing wit
h its neighbor's opinion may either adopt it or rewire its link to another
randomly chosen voter with any opinion. The system is studied by means of
the pair approximation in which a distinction between the average degrees
of nodes in different states is made. This approach allows us to identify
two dynamically active phases: a symmetric and an asymmetric one. The asy
mmetric active phase\, in contrast to the symmetric one\, is characterized
by different numbers of nodes in the opposite states that coexist in the
network. The pair approximation predicts the possibility of spontaneous sy
mmetry breaking\, which leads to a continuous phase transition between the
symmetric and the asymmetric active phases. In this case\, the absorbing
transition occurs between the asymmetric active and the absorbing phases a
fter the spontaneous symmetry breaking. Discontinuous phase transitions an
d hysteresis loops between both active phases are also possible. Interesti
ngly\, the asymmetric active phase is not displayed by the model where the
rewiring occurs only to voters sharing the same opinion\, studied by othe
r authors. Our results are backed up by Monte Carlo simulations.\n\nDuring
the talk\, we will compare both the versions of the model\, and we will s
ee how a seemingly small difference in the link rewiring dynamics leads to
profound differences in the phase diagrams exhibited by the models.\n\nht
tps://zakopane.if.uj.edu.pl/event/16/contributions/383/
URL:https://zakopane.if.uj.edu.pl/event/16/contributions/383/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Biological Networks Regulating Cell Fate Choice Are Minimally Frus
trated
DTSTART;VALUE=DATE-TIME:20201204T162000Z
DTEND;VALUE=DATE-TIME:20201204T164000Z
DTSTAMP;VALUE=DATE-TIME:20230209T100500Z
UID:indico-contribution-385@zakopane.if.uj.edu.pl
DESCRIPTION:Speakers: Shubham Tripathi (Northeastern University)\, David K
essler (Bar-Ilan University)\, Herbert Levine (Northeastern University)\n\
nCharacterization of the differences between biological and random network
s can reveal the design principles that enable the robust realization of c
rucial biological functions including the establishment of different cell
types. Previous studies\, focusing on identifying topological features tha
t are present in biological networks but not in random networks\, have\, h
owever\, provided few functional insights. We use a Boolean modeling frame
work and ideas from the spin glass literature to identify functional diffe
rences between five real biological networks and random networks with simi
lar topological features. We show that minimal frustration is a fundamenta
l property that allows biological networks to robustly establish cell type
s and regulate cell fate choice\, and that this property can emerge in com
plex networks via Darwinian evolution. The study also provides clues regar
ding how the regulation of cell fate choice can go awry in a disease like
cancer and lead to the emergence of aberrant cell types.\n\nhttps://zakopa
ne.if.uj.edu.pl/event/16/contributions/385/
URL:https://zakopane.if.uj.edu.pl/event/16/contributions/385/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Symmetries and asymmetries of times to complete a chemical cycle
DTSTART;VALUE=DATE-TIME:20201204T120000Z
DTEND;VALUE=DATE-TIME:20201204T122000Z
DTSTAMP;VALUE=DATE-TIME:20230209T100500Z
UID:indico-contribution-399@zakopane.if.uj.edu.pl
DESCRIPTION:Speakers: David Voráč (Charles University)\, Philipp Maass
(Universität Osnabrück)\, Dominik Lips (Universität Osnabrück)\, Artem
Ryabov (Charles University)\n\nMeasurements of durations of nonequilibriu
m stochastic processes provide valuable information on underlying microsco
pic kinetics and energetics. Theories for corresponding experiments to dat
e are well-developed for single-particle systems only. Little is known for
interacting systems in nonequilibrium environments. We introduce and disc
uss a basic model for cycle processes interacting with an environment that
can be out of thermodynamic equilibrium. We find a surprising richness of
cycle time variations with environmental conditions. This manifests itsel
f in unequal cycle times in forward and backward cycle directions\, speedi
ng up of backward cycles by interactions\, and dynamical phase transitions
\, where cycle times become multimodal functions of a bias. The model allo
ws us to relate these effects to specific microscopic mechanisms\, which c
an be helpful for interpreting experiments.\n\nhttps://zakopane.if.uj.edu.
pl/event/16/contributions/399/
URL:https://zakopane.if.uj.edu.pl/event/16/contributions/399/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Efficiency of energy harvesting out of colored Lévy fluctuations\
, by a harmonic piezoelectric transducer
DTSTART;VALUE=DATE-TIME:20201203T171000Z
DTEND;VALUE=DATE-TIME:20201203T171100Z
DTSTAMP;VALUE=DATE-TIME:20230209T100500Z
UID:indico-contribution-358@zakopane.if.uj.edu.pl
DESCRIPTION:Speakers: Martín E. Giuliano\, Alejandro D. Sánchez\, Robert
o R. Deza (IFIMAR)\, J. Ignacio Deza\n\nBased on studies where a linear pi
ezoelectric energy harvester is subjected to external random mechanical ex
citations modeled through Gaussian noises (white and colored)\, it was dec
ided to propose a more general colored noise of the Levy α−stable type.
Analytical\, exact and approximate results and numerical results are pres
ented on the characteristics of such excitations and the electrical power
that can be extracted from them.\n\nhttps://zakopane.if.uj.edu.pl/event/16
/contributions/358/
URL:https://zakopane.if.uj.edu.pl/event/16/contributions/358/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Restart: The Physics Of Starting Anew
DTSTART;VALUE=DATE-TIME:20201203T153000Z
DTEND;VALUE=DATE-TIME:20201203T160000Z
DTSTAMP;VALUE=DATE-TIME:20230209T100500Z
UID:indico-contribution-364@zakopane.if.uj.edu.pl
DESCRIPTION:Speakers: Shlomi Reuveni (Tel Aviv University)\n\nStopping a p
rocess in its midst—only to start it all over again—may prolong\, leav
e unchanged\, or even shorten the time taken for its completion. Among the
se three possibilities\, the latter is particularly interesting as it sugg
ests that restart can be used to expedite the completion of complex proces
ses involving strong elements of chance. This turned out to be important i
n computer science where restart drastically improves performance of rando
mized algorithms\, but is not less relevant to many physical\, chemical\,
and biological processes where restart plays a central role. In this talk\
, I will provide an introduction to the theory of restart phenomena and re
view some of its applications in statistical\, chemical\, and biological p
hysics. \n\nReferences\n\n[1] S. Reuveni\, Phys. Rev. Lett. **116**\, 1706
01 (2016).\n[2] A. Pal & S. Reuveni\, Phys. Rev. Lett. **118**\, 030603 (2
017).\n[3] A. Pal\, I. Eliazar & S. Reuveni\, Phys. Rev. Lett. **122**\, 0
20602 (2019).\n[4] S. Ray\, D. Mondal & S. Reuveni\, J. Phys. A. **52**\,
255002 (2019).\n[5] S. Ray & S. Reuveni\, J. Chem. Phys. **152**\, 234110
(2020).\n[6] O. T. Friedman\, A. Pal\, A. Sekhon\, S. Reuveni & Y. Roichma
n\, J. Phys. Chem. Lett. **11**\, 7350 (2020).\n[7] A. Pal\, Ł. Kuśmierz
& S. Reuveni\, Phys. Rev. Research **2**\, 043174 (2020).\n\nhttps://zako
pane.if.uj.edu.pl/event/16/contributions/364/
URL:https://zakopane.if.uj.edu.pl/event/16/contributions/364/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Effective Langevin equations leading to large deviation function o
f time-averaged velocity for a nonequilibrium Rayleigh piston
DTSTART;VALUE=DATE-TIME:20201204T091000Z
DTEND;VALUE=DATE-TIME:20201204T093000Z
DTSTAMP;VALUE=DATE-TIME:20230209T100500Z
UID:indico-contribution-386@zakopane.if.uj.edu.pl
DESCRIPTION:Speakers: Naoko Nakagawa (Ibaraki University)\, Masato Itami (
Nagoya University)\, Yohei Nakayama (Tohoku University)\, Shin-ichi Sasa (
Kyoto University)\n\nWe study fluctuating dynamics of a freely movable pis
ton that separates an infinite cylinder into two regions filled with ideal
gas particles at the same pressure but different temperatures. To investi
gate statistical properties of the time-averaged velocity of the piston in
the long-time limit\, we perturbatively calculate the large deviation fun
ction of the time-averaged velocity. Then\, we derive an infinite number o
f effective Langevin equations yielding the same large deviation function
as in the original model. Finally\, we provide two possibilities for uniqu
ely determining the form of the effective model.\n\nhttps://zakopane.if.uj
.edu.pl/event/16/contributions/386/
URL:https://zakopane.if.uj.edu.pl/event/16/contributions/386/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Search efficiency of (discrete) fractional Brownian motion in a ra
ndom distribution of targets
DTSTART;VALUE=DATE-TIME:20201203T170900Z
DTEND;VALUE=DATE-TIME:20201203T171000Z
DTSTAMP;VALUE=DATE-TIME:20230209T100500Z
UID:indico-contribution-375@zakopane.if.uj.edu.pl
DESCRIPTION:Speakers: Sabine H.L. Klapp (Technische Universität Berlin)\,
Rainer Klages (Queen Mary University of London)\, Seyed Mohsen Jebreiil K
hadem (Technische Universität Berlin)\n\nEfficiency of search for randoml
y distributed targets is a prominent problem in many branches\nof the scie
nces. For the stochastic process of Lévy walks\, a specific range of opt
imal efficiencies\nwas suggested under variation of search intrinsic and e
xtrinsic environmental parameters. We study fractional Brownian motion as
a search process\, which under parameter variation\ngenerates all three ba
sic types of diffusion\, from sub- to normal to superdiffusion. In contras
t to Lévy\nwalks\, fractional Brownian motion defines a Gaussian stochas
tic process with power law memory\nyielding anti-persistent\, respectively
persistent motion. Computer simulations of this search process\nin a unif
ormly random distribution of targets show that maximising search efficienc
ies sensitively\ndepends on the definition of efficiency\, the variation o
f both intrinsic and extrinsic parameters\, the\nperception of targets\, t
he type of targets\, whether to detect only one or many of them\, and the\
nchoice of boundary conditions. We find that different search scenarios fa
vour different modes of\nmotion for optimising search success\, defying a
universality across all search situations. Some of our\nresults are explai
ned by a simple analytical model. Having demonstrated that search by fract
ional\nBrownian motion is a truly complex process\, we propose an over-arc
hing conceptual framework\nbased on classifying different search scenarios
. This approach incorporates search optimisation by\nLévy walks as a spe
cial case.\n\nhttps://zakopane.if.uj.edu.pl/event/16/contributions/375/
URL:https://zakopane.if.uj.edu.pl/event/16/contributions/375/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Simple mathematical models for self-propelled motion on the water
surface.
DTSTART;VALUE=DATE-TIME:20201203T162000Z
DTEND;VALUE=DATE-TIME:20201203T164000Z
DTSTAMP;VALUE=DATE-TIME:20230209T100500Z
UID:indico-contribution-387@zakopane.if.uj.edu.pl
DESCRIPTION:Speakers: Satoshi Nakata\, Hiroyuki Kitahata\, Yuki Koyano\, J
erzy Gorecki (ICHF PAN)\n\nSelf-propelled motion on the water surface has
fascinated scientists for almost two hundred years. There are many solid s
ubstances\, such as camphor\, camphene\,\nand phenanthroline\, which can d
evelop to the water surface as a molecular layer\, evaporate to the air ph
ase and continuously dissolve into the water phase. This surface layer dec
reases the water surface tension and this decrease is local and time-depen
dent. Inhomogeneities in the surface concentration\, resulting from fluct
uations in release and evaporation\, can break the symmetry around an obje
ct and drive its motion. The mathematical description of the self-propell
ed motion is complex because it should include object location\, generated
hydrodynamic flows\, and dissipation of surface-active molecules. The sim
plest mathematical models consider the object position together with the c
oncentration of surface-active molecules described by a reaction-diffusion
equation in which the effective diffusion coefficient includes a hydrodyn
amic effect. However\, \nthere are many interesting examples of systems w
here the motion of a self-propelled object is strongly coupled with genera
ted hydrodynamic flows and in such cases\, the model mentioned above fails
. We introduce another simple mathematical model that describes the time e
volution of a self-propelled object on a liquid surface using such variabl
es as the object location\, the surface concentration of active molecules\
, and the hydrodynamic surface flow. The model is applied to simulate the
time evolution of a rotor composed of a polygonal plate with camphor pills
at its corners. We have qualitatively reproduced results of experiments\,
in which the inversions of rotational direction under periodic stop- and
release- operations were investigated. The model correctly describes the p
robability of the inversion as a function of the duration of the phase whe
n the rotor is stopped. Moreover\, the model allows us to introduce the ro
tor asymmetry unavoidable in real experiments and study its influence on t
he studied phenomenon. Our numerical simulations have revealed that the pr
obability of the inversion of rotational direction is determined by the co
mpetition among the transport of the camphor molecules by the flow\, the i
ntrinsic asymmetry of the rotor\, and the noise amplitude.\n\nhttps://zako
pane.if.uj.edu.pl/event/16/contributions/387/
URL:https://zakopane.if.uj.edu.pl/event/16/contributions/387/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Anomalous Diffusion and Generalized Cattaneo Equation
DTSTART;VALUE=DATE-TIME:20201204T083000Z
DTEND;VALUE=DATE-TIME:20201204T085000Z
DTSTAMP;VALUE=DATE-TIME:20230209T100500Z
UID:indico-contribution-388@zakopane.if.uj.edu.pl
DESCRIPTION:Speakers: Katarzyna Gorska (Institute of Nuclear Physics\, Pol
ish Academy of Sciences)\n\nThe generalized Cattaneo equation (GTE) involv
ing memory effect is introduced by smearing the time derivatives. Consiste
ncy conditions which the smearing functions obey restrict freedom in their
choice. The proposed scheme goes beyond the approach based on using fract
ional derivatives. I present the conditions under which solutions of the G
TE can be recognized as probability distribution\, i.e. are normalizable a
nd nonnegative on their domain.\n\nhttps://zakopane.if.uj.edu.pl/event/16/
contributions/388/
URL:https://zakopane.if.uj.edu.pl/event/16/contributions/388/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The role of ergotropy in the quantum thermodynamics
DTSTART;VALUE=DATE-TIME:20201204T124000Z
DTEND;VALUE=DATE-TIME:20201204T130000Z
DTSTAMP;VALUE=DATE-TIME:20230209T100500Z
UID:indico-contribution-392@zakopane.if.uj.edu.pl
DESCRIPTION:Speakers: Marcin Łobejko (University of Gdansk)\n\nErgotropy
is a state function of a density matrix which physical interpretation is t
he optimal work that can be extracted through the arbitrary unitary channe
l. The concept naturally appears in frameworks with implicit work reservoi
rs (e.g. external fields modeled by time-dependent Hamiltonians)\, where\,
in particular\, the process of charging and discharging of so-called quan
tum batteries is studied. We reveal that the same quantity appears in auto
nomous systems with an idealized model of the work reservoir - a quantum w
eight. Despite similarities between those two approaches\, we reveal a fun
damental difference\, namely the emergence of the locked energy in coheren
ces\, i.e. the quantum part of the state that contributes to ergotropy but
cannot be extracted as a work. Furthermore\, we prove the relation betwee
n the ergotropy and free energy\, where the former can be interpreted as a
generalization of the latter for systems coupled to finite-size heat bath
s\, such that in the thermodynamic limit the total ergotropy of the system
and the heat bath approaches the free energy. As a consequence\, we deriv
e the second kind of locked energy\, due to the finite-size of the bath\,
which is given by the difference of free energy between the global passive
state and the corresponding equilibrium state.\n\nhttps://zakopane.if.uj.
edu.pl/event/16/contributions/392/
URL:https://zakopane.if.uj.edu.pl/event/16/contributions/392/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Electronic relaxation in solution: Exact solution of multi-state p
roblems in time domain
DTSTART;VALUE=DATE-TIME:20201203T170800Z
DTEND;VALUE=DATE-TIME:20201203T170900Z
DTSTAMP;VALUE=DATE-TIME:20230209T100500Z
UID:indico-contribution-374@zakopane.if.uj.edu.pl
DESCRIPTION:Speakers: Swati Mudra (Indian Institute of Technology Mandi\,
HP\, India)\, Aniruddha Chakraborty (Indian Institute of Technology Mandi\
, HP\, India)\n\nElectronic relaxation in solution is an interesting pheno
menon from experimental as well as theoretical point of view. This diffusi
on controlled process has been theoretically modeled by using Smoluchowski
equation with a position dependent sink term. The problem has been solved
for different potentials and sink functions. Single state problem where S
moluchowski equation for harmonic potential with a Dirac delta sink is the
most general model which has been solved analytically in Laplace domain.
Due to the complexity of equation\, there is no time domain solution have
been reported. In this work\, we will give the exact analytical solution f
or this problem in time domain. We have solved one dimensional Smoluchowsk
i equation for harmonic potential with a sink of ultra-short width. This p
roblem has been solved for single state as well as two state model exactly
in time domain. We have used Green's function method to solve the equatio
n and calculated survival probability. For two state model\, survival prob
ability for both the states have been calculated explicitly. We have devel
oped a general method to solve single state as well as coupled two state m
odel which can be used to solve many similar problems.\n\nhttps://zakopane
.if.uj.edu.pl/event/16/contributions/374/
URL:https://zakopane.if.uj.edu.pl/event/16/contributions/374/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The q-voter model with attractive and repulsive interactions and i
ndependence on random graphs
DTSTART;VALUE=DATE-TIME:20201204T112000Z
DTEND;VALUE=DATE-TIME:20201204T114000Z
DTSTAMP;VALUE=DATE-TIME:20230209T100500Z
UID:indico-contribution-400@zakopane.if.uj.edu.pl
DESCRIPTION:Speakers: Andrzej Krawiecki (Faculty of Physics\, Warsaw Unive
rsity of Technology)\n\nThe $q$-voter model with both attractive (roughly
speaking\, ferromagnetic-like) and repulsive (antiferromagnetic-like) inte
ractions on random graphs is investigated. In this model the agent\, repre
sented by a two-state spin located in a node of a graph\, with probability
$1-p$ changes his/her opinion under the influence of a clique of $q$ rand
omly chosen neighbors and with probability $p$ acts independently and chan
ges opinion randomly. In the former case the agent changes opinion if opin
ions of all selected neighbors interacting with him/her attractively via t
he attached edges of the graph ("friends") are opposite and simultaneously
opinions of all selected neighbors interacting with him/her repulsively (
"disliked persons") are the same as the agent's one. The parameter $p$ mea
sures the level of stochastic noise in the model. For $q\\ge 4$ the model
on graphs with large mean degree of nodes exhibits first-order ferromagnet
ic transition with decreasing $p$\, with a clearly visible hysteresis loop
. The width of this loop decreases with increasing fraction of the repulsi
ve interactions and the transition can eventually become second-order. For
$q<4$ the transition is always second-order. An extension of the pair app
roximation taking into account presence of the repulsive interactions pred
icts quantitatively well results of Monte Carlo simulations of the model i
n a broad range of parameters.\n\nhttps://zakopane.if.uj.edu.pl/event/16/c
ontributions/400/
URL:https://zakopane.if.uj.edu.pl/event/16/contributions/400/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Exploring shape space for densest random sequential adsorption pac
king
DTSTART;VALUE=DATE-TIME:20201203T170300Z
DTEND;VALUE=DATE-TIME:20201203T170400Z
DTSTAMP;VALUE=DATE-TIME:20230209T100500Z
UID:indico-contribution-415@zakopane.if.uj.edu.pl
DESCRIPTION:Speakers: Piotr Kubala (Institute of Theoretical Physics\, Jag
iellonian University)\, Konrad Kozubek (Institute of Theoretical Physics\,
Jagiellonian University)\, Adrian Baule (Queen Mary University of London)
\, Michal Cieśla (Institute of Theoretical Physics\, Jagiellonian Univers
ity)\n\nRandom sequential adsorption of various shapes built of disks is s
tudied to determine the shape\, which follows to densest random packing.
Using the evolutionary algorithm to sample the space of shapes\, we found
that independently of the number of used disks\, the optimal shape tends t
o a triangle with rounded corners. Thus\, we run the same algorithm to st
udy packings built of rounded polygons. Both these approaches indicate th
at the shape building the densest RSA packings is the rounded triangle\, f
or which the packing fraction is 0.600608±0.000017\, which is the highest
known value so far.\n\nhttps://zakopane.if.uj.edu.pl/event/16/contributio
ns/415/
URL:https://zakopane.if.uj.edu.pl/event/16/contributions/415/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Galilean invariance for stochastic diffusive dynamics
DTSTART;VALUE=DATE-TIME:20201204T080000Z
DTEND;VALUE=DATE-TIME:20201204T083000Z
DTSTAMP;VALUE=DATE-TIME:20230209T100500Z
UID:indico-contribution-369@zakopane.if.uj.edu.pl
DESCRIPTION:Speakers: Rainer Klages (Queen Mary University of London)\, An
drea Cairoli (Crick Institute)\, Adrian Baule (Queen Mary University of Lo
ndon)\n\nGalilean invariance is a cornerstone of classical mechanics. It s
tates that the equations of motion are the same in different inertial fram
es meaning they do not change under a Galilean transformation. Inertial fr
ames\, in turn\, are reference frames describing closed systems where the
frame-internal physics is not affected by frame-external forces. The descr
iption of real world systems\, however\, usually requires coarse-grained m
odels integrating complex internal and external interactions indistinguish
ably as friction and stochastic forces\, which intrinsically violates Gali
lean invariance. Starting from the Kac-Zwanzig Hamiltonian for a tracer pa
rticle in a heat bath of harmonic oscillators generating Brownian motion\,
we show how Galilean invariance is broken during the coarse graining proc
edure when deriving stochastic Langevin dynamics. We argue that traces of
Galilean invariance survive for stochastic dynamics yielding a set of alte
rnative rules\, which we call weak Galilean invariance.\n\n[1] A.Cairoli\,
R.Klages\, A.Baule\, Weak Galilean invariance as a selection principle fo
r coarse-grained diffusive models\, PNAS 115\, 5714 (2018)\n\nhttps://zako
pane.if.uj.edu.pl/event/16/contributions/369/
URL:https://zakopane.if.uj.edu.pl/event/16/contributions/369/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Modeling Echo Chambers and Polarization Dynamics in Social Network
s
DTSTART;VALUE=DATE-TIME:20201204T114000Z
DTEND;VALUE=DATE-TIME:20201204T120000Z
DTSTAMP;VALUE=DATE-TIME:20230209T100500Z
UID:indico-contribution-384@zakopane.if.uj.edu.pl
DESCRIPTION:Speakers: Michele Starnini (Institute of Scientific Interchang
e\, Turin)\, Fabian Baumann (Humbold University at Berlin)\, Philipp Loren
z-Spreen (Max Planck Institute for Human Development)\, Igor Sokolov (Humb
old University at Berlin)\n\nEcho chambers and opinion polarization recent
ly quantified in several sociopolitical contexts and across different soci
al media raise concerns on their potential impact on the spread of misinfo
rmation and on the openness of debates. Despite increasing efforts\, the d
ynamics leading to the emergence of these phenomena remain unclear. We pro
pose a model that introduces the dynamics of radicalization as a reinforci
ng mechanism driving the evolution to extreme opinions from moderate initi
al conditions. Inspired by empirical findings on social interaction dynami
cs\, we consider agents characterized by heterogeneous activities and homo
phily. We show that the transition between a global consensus and emerging
radicalized states is mostly governed by social influence and by the cont
roversialness of the topic discussed. Compared with empirical data of pola
rized debates on Twitter\, the model qualitatively reproduces the observed
relation between users’ engagement and opinions\, as well as opinion se
gregation in the interaction network. Our findings shed light on the mecha
nisms that may lie at the core of the emergence of echo chambers and polar
ization in social media.\n\nhttps://zakopane.if.uj.edu.pl/event/16/contrib
utions/384/
URL:https://zakopane.if.uj.edu.pl/event/16/contributions/384/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Diffusion limitations and translocation barriers in atomically thi
n biomimetic pores
DTSTART;VALUE=DATE-TIME:20201204T164000Z
DTEND;VALUE=DATE-TIME:20201204T170000Z
DTSTAMP;VALUE=DATE-TIME:20230209T100500Z
UID:indico-contribution-401@zakopane.if.uj.edu.pl
DESCRIPTION:Speakers: Michael Zwolak (NIST)\, Subin Sahu (University of Co
lorado - Boulder)\n\nIonic transport in nano- to sub-nano-scale pores is h
ighly dependent on translocation barriers and potential wells. These featu
res in the free-energy landscape are primarily the result of ion dehydrati
on and electrostatic interactions. For pores in atomically thin membranes\
, such as graphene\, other factors come into play. Ion dynamics both insid
e and outside the geometric volume of the pore can be critical in determin
ing the transport properties of the channel due to several commensurate le
ngth scales\, such as the effective membrane thickness\, radii of the firs
t and the second hydration layers\, pore radius\, and Debye length. In par
ticular\, for biomimetic pores\, such as the graphene crown ether we exami
ne\, there are regimes where transport is highly sensitive to the pore siz
e due to the interplay of dehydration and interaction with pore charge. Pi
cometer changes in the size\, e.g.\, due to a minute strain\, can lead to
a large change in conductance. Outside of these regimes\, the small pore s
ize itself gives a large resistance even when electrostatic factors and de
hydration compensate each other to give a relatively flat - e.g.\, near ba
rrierless - free energy landscape. The permeability\, though\, can still b
e large and ions will translocate rapidly after they arrive within the cap
ture radius of the pore. This\, in turn\, leads to diffusion and drift eff
ects dominating the conductance. The current thus plateaus and becomes eff
ectively independent of pore free energy characteristics. Measurement of t
his effect will give an estimate of the magnitude of kinetically-limiting
features and experimentally constrain the local electromechanical conditio
ns.\n\nhttps://zakopane.if.uj.edu.pl/event/16/contributions/401/
URL:https://zakopane.if.uj.edu.pl/event/16/contributions/401/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Temperature-dependent Smoluchowski equations
DTSTART;VALUE=DATE-TIME:20201203T170600Z
DTEND;VALUE=DATE-TIME:20201203T170700Z
DTSTAMP;VALUE=DATE-TIME:20230209T100500Z
UID:indico-contribution-378@zakopane.if.uj.edu.pl
DESCRIPTION:Speakers: Nikolai Brilliantov (Skolkovo Institute of Science a
nd Technology)\, Arno Formella (Department of Computer Science\, Universit
y of Vigo)\, Thorsten Poeschel (Institute for Multiscale Simulation\, Frie
drich-Alexander-Universität Erlangen-Nürnberg)\, Alexander Osinsky (Skol
kovo Institute of Science and Technology)\n\nWe report a new class of Smol
uchowski-like equations for ballistically aggregating particles in a space
-uniform system. They naturally emerge when the derivation of the aggregat
ion equations is performed starting from the Boltzmann kinetic equation fo
r the mass-velocity distribution functions [1]. Then the system of equatio
ns for the zero-order moments of the distribution functions – the concen
trations of aggregates of different size\, corresponds to the conventional
Smoluchowski equations. The aggregation rate coefficients of these equati
ons depend on the second moments of the distribution function – partial
temperatures of the aggregates. In this way\, we obtain two coupled system
s of equations – for the concentrations and temperatures [1]. We show th
at\, depending on the aggregation probability\, these equations provide tw
o main types of scaling. The first one\, when all collisions are aggregati
ve leads to Smoluchowski-type evolution with a gradual decrease in tempera
ture. The second one\, when only a small fraction of collisions are aggreg
ative\, results in a stunning effect of the aggregation with temperature g
rowth. We show that the temperature increase may be stable and perpetual u
ntil the system remains large enough for the notion of the temperature to
persist. We also estimate the system parameters (restitution coefficient\,
aggregation probability)\, which can lead to this type of scaling. The th
eoretical results are confirmed by the numerical simulations.\n\n[1] N. Br
illiantov\, T. Poeschel\, and A. Formella\, Increasing temperature of cool
ing granular gases\, Nature Communications\, 9 (2018) 797.\n\nhttps://z
akopane.if.uj.edu.pl/event/16/contributions/378/
URL:https://zakopane.if.uj.edu.pl/event/16/contributions/378/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Energetics of critical oscillators in active bacterial baths
DTSTART;VALUE=DATE-TIME:20201203T170700Z
DTEND;VALUE=DATE-TIME:20201203T170800Z
DTSTAMP;VALUE=DATE-TIME:20230209T100500Z
UID:indico-contribution-373@zakopane.if.uj.edu.pl
DESCRIPTION:Speakers: Edgar Roldan (Max Planck Institute for the Physics o
f Complex Systems)\, Ashwin Gopal (University of Luxembourg)\, Stefano Ruf
fo (SISSA)\n\nWe investigate the nonequilibrium energetics near a critical
point of a non-linear driven oscillator immersed in an active bacterial
bath. At the critical point\, we reveal a scaling exponent of the average
power $\\langle\\dot{W}\\rangle\\sim (D_{\\rm a}/\\tau)^{1/4}$ where $D_{
\\rm a}$ is the effective diffusivity and $\\tau$ the correlation time of
the bacterial bath described by Gaussian colored noise. Other features th
at we investigate are the average stationary power and the variance of the
work both below and above the saddle-node bifurcation. Above the bifurca
tion\, the average power attains an optimal\, minimum value for finite $\
\tau$ that is below its zero-temperature limit. Furthermore\, we reveal a
finite-time uncertainty relation for active matter\, which leads to values
of the Fano factor of the work that can be below $2k_{\\rm B}T_{\\rm eff
}$\, with $T_{\\rm eff}$ the effective temperature of the oscillator in th
e bacterial bath. We analyze different Markovian approximations to describ
e the nonequilibrium stationary state of the system. Finally\, we illustra
te our results in the experimental context by considering the example of d
riven colloidal particles in periodic optical potentials within a E. Coli
bacterial bath.\n\nhttps://zakopane.if.uj.edu.pl/event/16/contributions/37
3/
URL:https://zakopane.if.uj.edu.pl/event/16/contributions/373/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Exploring "inverse stochastic resonance” and nonstandard stochas
tic resonance with information-theoretic tools
DTSTART;VALUE=DATE-TIME:20201203T171100Z
DTEND;VALUE=DATE-TIME:20201203T171200Z
DTSTAMP;VALUE=DATE-TIME:20230209T100500Z
UID:indico-contribution-407@zakopane.if.uj.edu.pl
DESCRIPTION:Speakers: Nataniel Martinez (IFIMA-CONICET)\, Roberto R. Deza
(IFIMAR)\n\nSome pacemaker neurons show a depression of their mean firing
rate for intermediate noise amplitudes\, which reminds the response enhanc
ement known as “stochastic resonance” (SR). Even though its analogy wi
th SR goes no further\, this phenomenon has been termed “inverse stochas
tic resonance” (ISR). In a recent work\, the ISR phenomenon -as well as
its close relative “nonstandard SR” (or more properly\, noise-induced
activity amplification\, NIAA)- have been shown to stem from the weak-nois
e quenching of the initial distribution\, in bistable regimes where the me
tastable state has a larger attraction basin than the global minimum. To f
urther illustrate the mechanism whereby the ISR and NIAA phenomena take pl
ace\, we revisit the one-variable model that led to that conclusion\, expl
oring it with information-theoretic tools.\n\nhttps://zakopane.if.uj.edu.p
l/event/16/contributions/407/
URL:https://zakopane.if.uj.edu.pl/event/16/contributions/407/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Finite element modelling of atomic force indentation of an animal
cell
DTSTART;VALUE=DATE-TIME:20201203T171800Z
DTEND;VALUE=DATE-TIME:20201203T171900Z
DTSTAMP;VALUE=DATE-TIME:20230209T100500Z
UID:indico-contribution-408@zakopane.if.uj.edu.pl
DESCRIPTION:Speakers: Jakub Barbasz (Instytut Katalizy i Fizyochemii Powie
rzchni im. Jerzego Habera PAN)\, Agnieszka Kurek (Jerzy Haber Institute of
Catalysis and Surface Chemistry\, Polish Academy of Sciences)\, Magdalena
Giergiel (Zakład Fizyki Nanostruktur i Nanotechnologii\, Instytut Fizyk
i UJ )\, Leszek Krzemien (Instytut Katalizy i Fizykochemii Powierzchni im.
Jerzego Habera Polskiej Akademii Nauk)\n\nWe present a model of atomic fo
rce microscope indentation measurements using the finite element method. T
he focus is set on a thorough representation of the complex structure of a
n animal cell. Crucial constituent is the cell cortex — a stiff layer of
cytoplasmic proteins present on the inner side of the cell membrane. It p
lays a vital role in the mechanical interactions between cells. In our mod
el\, the cell cortex is modelled by a three-dimensional solid characterize
d primarily by its bending stiffness. This approach allows us to interpret
the measurements of the mechanical properties of the cells\, such as elas
ticity. During the simulations\, we probe a broad range of parameters defi
ning cell properties and experimental conditions. Finally\, we derive a si
mple and closed-form formula that approximates the simulated results with
satisfactory accuracy. Our formula is as easy to use as Hertz's function i
n order to extract cell properties from the measurement\, with additional
consideration of the cell inner structure.\n\nhttps://zakopane.if.uj.edu.p
l/event/16/contributions/408/
URL:https://zakopane.if.uj.edu.pl/event/16/contributions/408/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Experimental study of the energy flux between two NESS thermostats
.
DTSTART;VALUE=DATE-TIME:20201203T172000Z
DTEND;VALUE=DATE-TIME:20201203T172100Z
DTSTAMP;VALUE=DATE-TIME:20230209T100500Z
UID:indico-contribution-371@zakopane.if.uj.edu.pl
DESCRIPTION:Speakers: Antoine Naert (ENS - Lyon\, France)\n\nWe address th
e question of energy transport in out-of-equilibrium systems. The experime
nt consists in two coupled granular gas Non-Equilibrium Steady State (NESS
) heat baths\, in which $2$ cm-scale rotors are imbedded. These Brownian-l
ike mobiles are electro-mechanically coupled with a resistor R\, allowing
energy to flow between them. The mean flux is non-zero if the temperatures
of the baths differ. The resistor R allows measurement of the flux and th
e temperatures in each bath simultaneously. Varying $R$\, we show that\, i
n the limit of non-dissipative coupling ($R\\rightarrow 0$)\, the heat flu
x obey the ‘eXchange Fluctuation Theorem’ (XFT)\, in a form proposed b
y Jarzynski and Wojcik in $2004$\, for the fluctuations of the flux betwee
n finite size equilibrium heat baths. This result\, here obtained for gran
ular gas thermostats experiment\, is nevertheless representative of a larg
e class of NESS systems.\n\nhttps://zakopane.if.uj.edu.pl/event/16/contrib
utions/371/
URL:https://zakopane.if.uj.edu.pl/event/16/contributions/371/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Determination of psychotic behaviour using a network of chemical o
scillators
DTSTART;VALUE=DATE-TIME:20201203T172100Z
DTEND;VALUE=DATE-TIME:20201203T172200Z
DTSTAMP;VALUE=DATE-TIME:20230209T100500Z
UID:indico-contribution-357@zakopane.if.uj.edu.pl
DESCRIPTION:Speakers: Ashmita Bose (Institute of Physical chemistry\,Polis
h Academy of sciences)\, Jerzy Gorecki (Institute of Physical chemistry\,P
olish Academy of Sciences)\n\nSchizophrenia is the most common form of psy
chotic behaviour where patients experiences hallucination\, dillusion or c
haotic speech. Schizophrenia is difficult to detect and easily go undetect
ed for years. Here we propose the idea of detecting schizophrenia by a net
work of interacting chemical oscillators. We optimized a classifier based
on six interacting oscillator using genetic algorithm and obtained 82% acc
uracy of schizophrenia detection on a selected training dataset.\n\nKeywo
rds: Schizophrenia\, EEG signal\, chemical computing\, oscillatory network
\, Oregonator model\, genetic optimization\n\nhttps://zakopane.if.uj.edu.p
l/event/16/contributions/357/
URL:https://zakopane.if.uj.edu.pl/event/16/contributions/357/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Variational Approach to KPZ: Fluctuation Theorems\, Large Deviatio
n Function\, and Probability Distribution Function
DTSTART;VALUE=DATE-TIME:20201203T123000Z
DTEND;VALUE=DATE-TIME:20201203T125000Z
DTSTAMP;VALUE=DATE-TIME:20230209T100500Z
UID:indico-contribution-393@zakopane.if.uj.edu.pl
DESCRIPTION:Speakers: Jorge A. Revelli (IFEG)\, Miguel A. Rodriguez (Inst.
Fisica Cantabria)\, Rafael Gallego (Mathematics Department)\, Horacio S.
Wio (Inst.Fisica Interdisc.&Sist.Compl.)\, Roberto R. Deza (IFIMAR)\n\nThe
KPZ equation is - as known - a stochastic field theory that describes the
kinetic roughening of surfaces and interfaces\, plus many other nonequili
brium processes that belong to its universality class. For $\\lambda\\neq
0$\, the systems described are intrinsically unstable and "lack of station
ary probability distribution". This can be readily inferred from the struc
ture of the functional from which the deterministic KPZ equation stems in
a variational formulation [1]. In fact\, the time behavior of the aforemen
tioned functional resembles that of a particle in a gravitational field [2
]. A path-integral scheme has been set up in [3] that allows obtaining det
ailed and integral fluctuation theorems - as well as a Large Deviation Fun
ction for entropy production - for the KPZ equation\, "regardless of the s
ubstrate dimensionality" [4]. After reviewing these issues\, we close by d
iscussing an explicit expression of the probability distribution for the K
PZ system.\n\n[1] H.S. Wio\, "Variational formulation for the KPZ and rela
ted kinetic equations"\, Int. J. Bif. Chaos 19\, (2009) 2813-2821.\n[2] H
.S. Wio\, M.A.Rodriguez\, R.Gallego\, J.A.Revelli\, A. Ales and R.R.Deza\,
"d-Dimensional KPZ Equation as a Stochastic Gradient Flow in an Evolving
Landscape: Interpretation and Time Evolution of Its Generating Functional"
\, Front.Phys.4 (2017): 52.\n[3] H.S. Wio\, R.R. Deza and J.A. Revelli\, "
Fluctuation theorems and large deviation functions in systems not featurin
g a steady state"\, J. Stat. Mech. (2020) 024009.\n[4] H.S. Wio\, M.A. Rod
riguez and R. Gallego\, "Variational approach to KPZ: Fluctuation theorems
and large deviation function for entropy production"\, Chaos 30\, (2020)
073107.\n\nhttps://zakopane.if.uj.edu.pl/event/16/contributions/393/
URL:https://zakopane.if.uj.edu.pl/event/16/contributions/393/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Pre-poster session
DTSTART;VALUE=DATE-TIME:20201203T164000Z
DTEND;VALUE=DATE-TIME:20201203T170000Z
DTSTAMP;VALUE=DATE-TIME:20230209T100500Z
UID:indico-contribution-417@zakopane.if.uj.edu.pl
DESCRIPTION:Speakers: Paweł Góra (Jagiellonian University)\n\nhttps://za
kopane.if.uj.edu.pl/event/16/contributions/417/
URL:https://zakopane.if.uj.edu.pl/event/16/contributions/417/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Random walks with asymmetric time delays
DTSTART;VALUE=DATE-TIME:20201204T093000Z
DTEND;VALUE=DATE-TIME:20201204T095000Z
DTSTAMP;VALUE=DATE-TIME:20230209T100500Z
UID:indico-contribution-402@zakopane.if.uj.edu.pl
DESCRIPTION:Speakers: Jacek Miękisz (University of Warsaw)\, Kamil Łopus
zański\n\nWe study simple random-walk models with asymmetric time delays.
Probability of a walker to move to the right or to the left depends on a
difference between two state-dependent functions evaluated at states of th
e walker at two different times in the past. This might be seen as a model
of a discrete replicator dynamics with strategy-dependent time delays. We
assume hyperbolic-tangent fitness functions and to obtain analytical resu
lts we approximate them by step functions. \n\nWe observe a novel behavior
. Namely\, the mean position of the walker depends on time delays. This is
a joint effect of stochasticity and time delays present in the system. In
the deterministic version of a hyperbolic-tangent model\, there appear sy
mmetric cycles around a stationary point so the mean position of the walke
r stays the same. In stochastic versions without time delays\, the expecte
d value of the position of the walker is given by the stationary point.\n
\nIf one interprets a position of the walker as a fraction of the populati
on with a given strategy\, then our results show that this fraction is a d
ecreasing function of a delay\, in fact a linear one for small delays. Mor
eover\, bigger is the region with the (almost) unbiased random walk\, smal
ler is the fraction of the population of the strategy with a bigger time d
elay.\n\nhttps://zakopane.if.uj.edu.pl/event/16/contributions/402/
URL:https://zakopane.if.uj.edu.pl/event/16/contributions/402/
END:VEVENT
END:VCALENDAR