30th Marian Smoluchowski Symposium on Statistical Physics

Session

Session 9

6 Sept 2017, 11:00

Conveners

Session 9: Panel A

• Ralf Metzler (University of Potsdam)

138. Eliminating inertia of a stochastic microswimmer with constant speed

Lutz Schimansky-Geier (Department of Physics, Humboldt-University at Berlin)

06/09/2017, 11:00

oral

An often used model for an active entity is the two dimensional stochastic microswimmer. It moves due to a propulsive mechanism with constant speed and changes the direction due to deterministic and random torques. Despite the simplicity, the model it is not an overdamped situation. Intertia is reflected by an initial ballistic behaviour. Only after an crossover time being the relaxation time...

129. Heterogeneous continuous time random walk on graphs

Liubov Tupikina (Ecole Polytechnique)

06/09/2017, 11:30

oral

Solute transport and, particularly, diffusion of particles in porous media is a long standing problem [1]. The general random walks framework has been shown to describe quantitatively the anomalous transport patterns frequently observed in fractured and heterogeneous porous media [2]. One of the major conceptual difficulties consists in a very broad range of time and length scales in the...

12. Dynamics of self-propelled colloidal particles in viscoelastic fluids

Juan Ruben Gomez Solano (Universitaet Stuttgart)

06/09/2017, 11:45

oral

The motion of many natural microswimmers, e.g. bacteria and spermatozoa, commonly takes place in viscoelastic fluids and under confinement close to solid walls. The understanding of their swimming mechanisms has triggered a lot of experimental and theoretical work in recent years as well as the development of self-propelled colloidal particles. Although the motion of such synthetic...

7. The quantum first detection problem: from the energy spectrum to the detection probabilities

Felix Thiel (Bar-Ilan University)

06/09/2017, 12:00

oral

We consider the question of when a quantum system initially prepared in state A first ``arrives'' in state B, i.e. the first arrival problem in quantum physics. To determine the arrival, the observer attempts to detect the system stroboscopically with fixed period via a projective measurement. The time of the first successful detection attempt is the first detection time. The corresponding...

14. Switching of wake-mediated interaction caused by blockade effect and collective wake formation

Oleksandr Kliushnychenko (Institute of Physics, NASU, Kiev, Ukraine)

06/09/2017, 12:15

oral

The effect of concentration-dependent switching of the wake-mediated interaction between obstacles in a gas flow of interacting Brownian particles is presented. When increasing bath fraction exceeds half-filling, the interaction between obstacles switches from effective attraction to repulsion or vice-versa, depending on the mutual alignment of obstacles with respect to the gas flow. It is...