A toy model for a baby universe inside a black hole
Abstract
We present a dynamical toy model for an expanding universe inside a black hole. The model is built by matching a spherically symmetric collapsing matter cloud to an expanding Friedmann-Robertson-Walker universe through a phase transition that occurs in the quantum-gravity dominated region, here modeled with semi-classical corrections at high density. The matching is performed on a space-like hyper-surface identified by the co-moving time at which quantum-gravity induced effects halt collapse. The purpose of the model is to suggest a possible reconciliation between the observation that black holes are well described by the classical solutions and the fact that the theoretical resolution of space-time singularities leads to a bounce for the collapsing matter.
Keywords
Cite
@article{arxiv.1909.07129,
title = {A toy model for a baby universe inside a black hole},
author = {Hrishikesh Chakrabarty and Ahmadjon Abdujabbarov and Daniele Malafarina and Cosimo Bambi},
journal= {arXiv preprint arXiv:1909.07129},
year = {2020}
}
Comments
9 pages, 6 figures. v2: refereed version