Islands in Multiverse Models
High Energy Physics - Theory
2022-04-14 v3 General Relativity and Quantum Cosmology
Abstract
We consider multiverse models in two-dimensional linear dilaton-gravity theories as toy models of false vacuum eternal inflation. Coupling conformal matter we calculate the Von Neumann entropy of subregions. When these are sufficiently large we find that an island develops covering most of the rest of the multiverse, leading to a Page-like transition. This resonates with a description of multiverse models in semiclassical quantum cosmology, where a measure for local predictions is given by saddle point geometries which coarse-grain over any structure associated with eternal inflation beyond one's patch.
Keywords
Cite
@article{arxiv.2108.01278,
title = {Islands in Multiverse Models},
author = {Sergio E. Aguilar-Gutierrez and Aidan Chatwin-Davies and Thomas Hertog and Natalia Pinzani-Fokeeva and Brandon Robinson},
journal= {arXiv preprint arXiv:2108.01278},
year = {2022}
}
Comments
54 pages, 20 figures; v2 reflects accepted version; v3 added erratum and companion addendum