Speaker
Description
I will discuss 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 will learn that (cosmic) inflation in the time-reversed setting is a (quantum) mechanism that decelerates collapsing matter and prevents it from singularity formation. I will also discuss the global causal structure, in particular, the numerically computed conformal diagram and the viability of the model.
