Journal of High Energy Physics (Nov 2021)

Islands in multiverse models

  • Sergio E. Aguilar-Gutierrez,
  • Aidan Chatwin-Davies,
  • Thomas Hertog,
  • Natalia Pinzani-Fokeeva,
  • Brandon Robinson

DOI
https://doi.org/10.1007/JHEP11(2021)212
Journal volume & issue
Vol. 2021, no. 11
pp. 1 – 41

Abstract

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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.

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