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The Quantum Null Energy Condition and Entanglement Entropy in Quenches

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arxiv 1909.00919 v1 pith:2VYDQ27I submitted 2019-09-03 hep-th cond-mat.str-elquant-ph

The Quantum Null Energy Condition and Entanglement Entropy in Quenches

classification hep-th cond-mat.str-elquant-ph
keywords entropyentanglementqnecboundenergyfieldquantumquenches
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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The Quantum Null Energy Condition (QNEC) relates energy to the second variation of entropy in relativistic quantum field theory. We use the QNEC inequality to bound entanglement entropy in quenches. At early times the entanglement entropy grows quadratically in time, and the QNEC provides an upper bound on the prefactor. We demonstrate that the bound is tight, by showing that it is saturated in certain quench protocols: boundary state quenches in conformal field theories in any dimensions. In higher than two dimensions we compute entanglement entropy using AdS/CFT. Our results are the first purely field theoretic applications of the QNEC.

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    Proves integer Rényi QNEC by establishing log-convexity of Kosaki L^n norms under null-translation semigroups for σ-finite von Neumann algebras with half-sided modular inclusions, assuming only finite sandwiched Rényi...