Multiverse in Karch-Randall Braneworld

Abstract

In this paper, we propose a model based on wedge holography that can describe the multiverse. In wedge holography, we consider two gravitating baths, one of which has strong gravity and the other one has weak gravity. To describe a multiverse, we consider 2n Karch-Randall branes, and we propose that various d-dimensional universes are localized on these branes. These branes are embedded in (d + 1)-dimensional spacetime. The model is useful in obtaining the Page curve of black holes with multiple horizons and in the resolution of the "grandfather paradox". We explicitly obtain the Page curves of two eternal AdS black holes and Schwarzschild de-Sitter black hole with two horizons.

Massless Entanglement Islands in Cone Holography

“…Remarkably, [29] finds that the massless island puzzle can be resolved, provided that the bulk state breaks all asymptotic symmetries. See also [30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63] for some recent works on entanglement islands, Page curve and AdS/BCFT.…”