PAST COLLOQUIA


1. October 2020


3:30pm CEST

VIDEO

 

HANS RINGSTRÖM

(KTH Stockholm – Sweden)

Title: On highly anisotropic big bang singularities. 

Abstract: In cosmology, the universe is typically modelled by spatially homogeneous and isotropic solutions to Einstein’s equations. However, for large classes of matter models, such solutions are unstable in the direction of the singularity. For this reason, it is of interest to study the anisotropic setting. 

The purpose of the talk is to describe a framework for studying highly anisotropic singularities. In particular, for analysing the asymptotics of solutions to linear systems of wave equations on the corresponding backgrounds and deducing information concerning the geometry.

The talk will begin with an overview of existing results. This will serve as a background and motivation for the problem considered, but also as a justification for the assumptions defining the framework we develop.
Following this overview, the talk will conclude with a rough description of the results.