7-11 September 2015
Warsaw, Poland
Europe/Zurich timezone

How to model the effect of small-scale structures on light propagation?

9 Sep 2015, 12:30
20m
Rm 207 ()

Rm 207

Speaker

Pierre Fleury (IAP, France)

Description

In standard cosmology, observations are interpreted as if light propagated through a universe whose inhomogeneities are modeled by perturbations with respect to the FLRW spacetime. However, the very narrow light beams associated with point-like sources—such as supernovae—probe the Universe at extremely small scales (~AU), up to which the perturbative approach should break down. In this talk, I will present an alternative framework where the lensing due to small-scale structures is treated as a diffusion process.

Presentation Materials