July 9, 2020 to December 31, 2022
Europe/Zurich timezone

Isotropisation in the approach to a singularity

Oct 25, 2021, 3:00 PM
1h 20m

Speaker

Jerome Quintin (Albert Einstein Institute)

Description

In the approach to a singularity in general relativity, spacetime often becomes largely shear dominated and highly anisotropic. Any speculative cosmological scenario with a contracting phase prior to a Big Bounce must therefore address the issue of large anisotropies. In this talk, I will review this anisotropy problem and the status of isotropisation mechanisms in this context, which involve, e.g., modified gravity or non-perfect fluids. An emphasis will be given on the latter, in light of the recent work arXiv:2109.11701 [gr-qc].

Presentation materials