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High Energy Physics - Theory

arXiv:2108.01278 (hep-th)
[Submitted on 3 Aug 2021 (v1), last revised 13 Apr 2022 (this version, v3)]

Title:Islands in Multiverse Models

Authors:Sergio E. Aguilar-Gutierrez, Aidan Chatwin-Davies, Thomas Hertog, Natalia Pinzani-Fokeeva, Brandon Robinson
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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.
Comments: 54 pages, 20 figures; v2 reflects accepted version; v3 added erratum and companion addendum
Subjects: High Energy Physics - Theory (hep-th); General Relativity and Quantum Cosmology (gr-qc)
Cite as: arXiv:2108.01278 [hep-th]
  (or arXiv:2108.01278v3 [hep-th] for this version)
  https://doi.org/10.48550/arXiv.2108.01278
Related DOI: https://doi.org/10.1007/JHEP11%282021%29212

Submission history

From: Aidan Chatwin-Davies [view email]
[v1] Tue, 3 Aug 2021 03:57:19 UTC (3,039 KB)
[v2] Wed, 17 Nov 2021 22:31:06 UTC (3,033 KB)
[v3] Wed, 13 Apr 2022 00:18:27 UTC (4,134 KB)
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