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Shaping contours of entanglement islands in BCFT

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arxiv 2107.09083 v1 pith:C5RAHCGF submitted 2021-07-19 hep-th cond-mat.str-elgr-qcquant-ph

Shaping contours of entanglement islands in BCFT

classification hep-th cond-mat.str-elgr-qcquant-ph
keywords entanglementcontourbcftislandsboundarycurvepagerecently
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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In this paper, we study the fine structure of entanglement in holographic two-dimensional boundary conformal field theories (BCFT) in terms of the spatially resolved quasilocal extension of entanglement entropy - entanglement contour. We find that the boundary induces discontinuities in the contour revealing hidden localization-delocalization patterns of entanglement degrees of freedom. Moreover, we observe the formation of ``islands'' where the entanglement contour vanishes identically implying that these regions do not contribute to the entanglement at all. We argue that these phenomena are the manifestation of entanglement islands discussed recently in the literature. We apply the entanglement contour proposal to the recently proposed BCFT black hole models reproducing the Page curve - moving mirror model and the pair of BCFT in the thermofield double state. From the viewpoint of entanglement contour, the Page curve also carries the imprint of strong delocalization caused by dynamical entanglement islands.

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Cited by 4 Pith papers

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  2. Holography and Kinematic Space for Gravitational Sub-regions in AdS

    hep-th 2026-06 conditional novelty 6.0

    The paper proposes a kinematic space for any subregion of vacuum AdS, whose geodesic 'PEE threads' uniformly cover the subregion and yield tensor-network models that reproduce Ryu-Takayanagi entropy and realize surfac...

  3. Entanglement islands, fuzzballs and stretched horizons

    hep-th 2026-05 unverdicted novelty 6.0

    Fuzzball models with stretched horizons modify or eliminate entanglement islands depending on boundary conditions and cap geometry, producing information paradox analogues in some cases.

  4. Holography and Kinematic Space for Gravitational Sub-regions in AdS

    hep-th 2026-06 unverdicted novelty 5.0

    Extends kinematic space and PEE threads to subregions in AdS and builds tensor networks on them realizing surface-state correspondence for gravitational subregions.