The Page Curve for Reflected Entropy

Abstract

We study the reflected entropy $S_R$ in the West Coast Model, a toy model of black hole evaporation consisting of JT gravity coupled to end-of-the-world branes. We demonstrate the validity of the holographic duality relating it to the entanglement wedge cross section away from phase transitions. Further, we analyze the important non-perturbative effects that smooth out the discontinuity in the $S_R$ phase transition. By performing the gravitational path integral, we obtain the reflected entanglement spectrum analytically. The spectrum takes a simple form consisting of superselection sectors, which we interpret as a direct sum of geometries, a disconnected one and a connected one involving a closed universe. We find that area fluctuations of $O(\sqrt{G_N})$ spread out the $S_R$ phase transition in the canonical ensemble, analogous to the entanglement entropy phase transition. We also consider a Renyi generalization of the reflected entropy and show that the location of the phase transition varies as a function of the Renyi parameter.

arXiv comment25 pages, 11 pretty figures, minor clarifications added and typos fixed in v2, typo fixed in v3

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• The Markov gap in the presence of islands
• Reflected entropy in random tensor networks II: a topological index from the canonical purification
• Defect extremal surfaces for entanglement negativity
• Reflected Entropy in AdS${}_3$/WCFT
• Reflected Entropy for Communicating Black Holes I: Karch-Randall Braneworlds
• Mixed-state entanglement and information recovery in thermalized states and evaporating black holes
• Reflected Entropy and Entanglement Negativity for Holographic Moving Mirrors
• Reflected entropy in Galilean conformal field theories and flat holography
• The Reflected Entanglement Spectrum for Free Fermions
• Large and Small Corrections to the JLMS Formula from Replica Wormholes