Multiverse in Karch-Randall Braneworld

TL;DR

This paper introduces a wedge holography model with multiple Karch-Randall branes to describe a multiverse, enabling analysis of black hole Page curves and paradox resolution in higher-dimensional spacetime.

Contribution

It proposes a novel multiverse model using wedge holography with multiple branes, extending previous holographic frameworks to include complex multiverse scenarios.

Findings

Derived Page curves for multiverse black holes

Resolved the grandfather paradox in a holographic context

Analyzed black holes with multiple horizons in the model

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 eternal AdS black holes for $n=2$ multiverse and Schwarzschild de-Sitter black hole with two horizons.