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Entanglement Entropy Flow and the Ward Identity

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arxiv 1406.2716 v2 pith:6E2YDRKP submitted 2014-06-10 hep-th cond-mat.str-elgr-qc

Vladimir Rosenhaus , Michael Smolkin This is my paper · ORCID
classification hep-thcond-mat.str-elgr-qc
keywords entanglemententropycouplingsflowfunctionidentitylocalunder
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We derive differential equations for the flow of entanglement entropy as a function of the metric and the couplings of the theory. The variation of the universal part of entanglement entropy under a local Weyl transformation is related to the variation under a local change in the couplings. We show that this relation is in fact equivalent to the trace Ward identity. As a concrete application of our formalism, we express the entanglement entropy for massive free fields as a two-point function of the energy-momentum tensor.

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  1. The entropy of radiation for local quenches in higher dimensions

    hep-th 2025-01 conditional novelty 5.0 of 10

    For local quenches in d>2 CFTs, the excess entanglement entropy of radiation grows as ξ^{d/2} at early and late times, obeys an all-time relative-entropy bound, and the holographic model produces a Page-like curve.

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