Homology Conditions for RT Surfaces in Double Holography

TL;DR

This paper explores the conditions under which RT surfaces satisfy homology constraints in double holography, revealing how different perspectives affect entropy calculations and their relation to the island formula.

Contribution

It clarifies the homology constraints for RT surfaces in double holography and analyzes how different descriptions influence entropy computations and the emergence of islands.

Findings

Homology constraints depend on the holographic perspective.

Discrepancies in von Neumann entropy arise from different descriptions.

Complex operator mappings can lead to island formation and wormholes.

Abstract

Recently, a novel formula for computing entropy in theories coupled to semi-classical gravity has been devised. Using this so-called island formula the entropy of semi-classical black holes follows a Page curve. Here, we study the relation between this novel entropy and semi-classical entropy in the context of doubly-holographic models. Double holography allows for two different $d$-dimensional descriptions of a black hole coupled to a non-gravitational bath, both of which allow a holographic computation of von Neumann entropy in bath subregions. We argue that the correct homology constraint for Ryu-Takayanagi surfaces depends on which of those $d$-dimensional perspectives is taken. As a consequence the von Neumann entropies of a fixed subregion in both descriptions can disagree. We discuss how the von Neumann entropies in both descriptions are related to the entropy computed by the island formula and coarse grained entropy. Moreover, we argue that the way operators transform between the two descriptions depends on their complexity. A simple toy model is introduced to demonstrate that a sufficiently complicated map between two descriptions of the system can give rise to an island formula and wormholes. Lastly, we speculate about the relation between double-holography and black hole complementarity.