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Modular Hamiltonian of Excited States in Conformal Field Theory

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arxiv 1508.03506 v3 pith:E56XTP7M submitted 2015-08-14 hep-th cond-mat.stat-mech

classification hep-thcond-mat.stat-mech
keywords replicaconformalfieldfunctionsstatesarbitraryexcitedhamiltonian
verification ladder T0 review T1 audit T2 compute T3 formal
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We present a novel replica trick that computes the relative entropy of two arbitrary states in conformal field theory. Our replica trick is based on the analytic continuation of partition functions that break the replica Z_n symmetry. It provides a method for computing arbitrary matrix elements of the modular Hamiltonian corresponding to excited states in terms of correlation functions. We show that the quantum Fisher information in vacuum can be expressed in terms of two-point functions on the replica geometry. We perform sample calculations in two-dimensional conformal field theories.

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