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Defect Extremal Surface for Reflected Entropy

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arxiv 2108.08544 v1 pith:4XHHREGK submitted 2021-08-19 hep-th cond-mat.str-elgr-qcquant-ph

Defect Extremal Surface for Reflected Entropy

classification hep-th cond-mat.str-elgr-qcquant-ph
keywords defectformulaentropyextremalsurfacereflectedbranebulk
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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Defect extremal surface is defined by extremizing the Ryu-Takayanagi formula corrected by the quantum defect theory. This is interesting when the AdS bulk contains a defect brane (or string). We introduce a defect extremal surface formula for reflected entropy, which is a mixed state generalization of entanglement entropy measure. Based on a decomposition procedure of an AdS bulk with a brane, we demonstrate the equivalence between defect extremal surface formula and island formula for reflected entropy in AdS$_3$/BCFT$_2$. We also compute the evolution of reflected entropy in evaporating black hole model and find that defect extremal surface formula agrees with island formula.

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  1. Defects extremal surfaces and interface CFTs

    hep-th 2026-07 conditional novelty 4.0

    A generalized defect-extremal-surface prescription for AdS3/ICFT2 is shown to match island-formula entropies in the large-tension limit and to produce Page curves for 2d eternal black holes.