Seventeenth Marcel Grossmann Meeting

A non-singular universe out of Hayward black hole

8 Jul 2024, 17:20

20m

M5 (Palazzo Micara of the ‘Gabriele d’Annunzio’ University)

Talk in a parallel session Inflation: perturbations, initial singularities and emergent universes Inflation: perturbations, initial singularities and emergent universes

Speaker

Michał Bobula (University of Wrocław)

Description

We construct a (quantum mechanically) modified model for the Oppenheimer-Snyder collapse scenario where the exterior of the collapsing dust ball is a Hayward black hole spacetime and the interior is a dust Friedmann-Robertson-Walker cosmology. This interior cosmology is entirely determined by the junction conditions with the exterior black hole. It turns out to be non-singular, displaying a power-law contraction which precedes a de Sitter phase or, reversely, a power-law expansion followed by a de Sitter era. We also analyse the global causal structure and the viability of the model.