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by Multiverse Theory: as real as the movies make it out to beMarch 5th, 2024

**Authors:**

(1) Gopal Yadav, Department of Physics, Indian Institute of Technology & Chennai Mathematical Institute.

Brief Review of Wedge Holography

Emerging Multiverse from Wedge Holography

Application to Information Paradox

Application to Grandfather Paradox

Acknowledgements and References

• **Boundary description:** CF Td−1 living on the wedge of common boundaries of two AdSd’s.

• **Intermediate description:** Two Karch-Randall branes of geometry AdSd (Q1 and Q2) glued to each other at the interface point by a transparent boundary condition.

• **Bulk description:** Einstein gravity in (d + 1)-dimensional bulk, AdSd+1.

Precisely, correspondence can be interpreted as: “Classical gravity in (d + 1)-dimensions has a holographic dual theory on the defect which is CFT in (d − 1)-dimensions”.

Wedge holography is useful in the computation of the Page curve of black holes. Let us understand this connection. In the intermediate description, we consider a black hole on Q2 whose Hawking radiation will be collected by weakly gravitating bath Q1 (i.e., T1 < T2). To calculate the entanglement entropy in the intermediate description, one is required to use the semiclassical formula:

where γ is the minimal surface in bulk. In wedge holography, there is one more extremal surface, Hartman-Maldacena surface [30], which starts at the defect, crosses the horizons, and meets its thermofield double. By plotting the entanglement entropies contributions of these surfaces, we can get the Page curve [2].

This paper is available on arxiv under CC 4.0 license.

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