Islands in Multiverse Models
arXiv:2108.01278 · doi:10.1007/JHEP11(2021)212
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.
54 pages, 20 figures; v2 reflects accepted version; v3 added erratum and companion addendum
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Cited by in corpus (11)
- Quasi-local energy and microcanonical entropy in two-dimensional nearly de Sitter gravity
- An Outsider's Perspective on Information Recovery in de Sitter Space
- Encoding beyond cosmological horizons in de Sitter JT gravity
- Defect extremal surfaces for entanglement negativity
- Cosmologies, singularities and quantum extremal surfaces
- Implication of island for inflation and primordial perturbations
- Islands and the de Sitter entropy bound
- Information paradox and island in quasi-de Sitter space
- Reflected Entropy and Entanglement Negativity for Holographic Moving Mirrors
- Aspects of Jackiw-Teitelboim Gravity in Anti-de Sitter and de Sitter spacetime
- Observational Imprints of Our Lost Twin Anti-Universe