<p>Inhomogeneous Cosmologies III<p>

Session

Tuesday Session 2

18 Sept 2018, 11:00

Conveners

Tuesday Session 2

• Jessie Durk (Queen Mary University of London)

9. Covariant and observer-independent approach to geometric optics in GR

Mikołaj Korzyński (Center for Theoretical Physics, Polish Academy of Sciences)

18/09/2018, 11:00

I will present a covariant and observer-independent approach to geometric optics in GR. I will discuss how one can calculate the parallax, the image distortion and magnification and the position drift, including all GR effects, of a distant source using bilocal optical operators. The formalism can be applied to any metric and has potentially important applications to cosmology and relativistic...

23. The distance - redshift relation in the inhomogeneous universe: improving perturbation theory

Eleonora Villa (CFT PAN)

18/09/2018, 11:30

We consider an approximation scheme aiming at accounting for the effect of non-linear inhomogeneities in relativistic cosmology at all scales of interest: the perturbations in the space-time metric are considered to be small, but a different weight is given to their first and second spatial derivatives, taking into account that peculiar velocities - corresponding to first spatial derivatives -...

12. Reciprocity and symplecticity

Nezihe Uzun (Ústav teoretické fyziky MFF UK)

18/09/2018, 12:00

Reciprocity relations in physics signal the existence of potentiality of a system. Maxwell-Betti reciprocity for virtual work in elasticity, Onsager's reciprocity in thermodynamics or quantum mechanical reciprocity of the received signal all state that the observables are unchanged when the input and output agents are traversed. Those distinct systems share a similar property: they are defined...