Holographic Entanglement Entropy from 2d CFT: Heavy States and Local Quenches

Abstract

We consider the entanglement entropy in 2d conformal field theory in a class of excited states produced by the insertion of a heavy local operator. These include both high-energy eigenstates of the Hamiltonian and time-dependent local quenches. We compute the universal contribution from the stress tensor to the single interval Renyi entropies and entanglement entropy, and conjecture that this dominates the answer in theories with a large central charge and a sparse spectrum of low-dimension operators. The resulting entanglement entropies agree precisely with holographic calculations in three-dimensional gravity. High-energy eigenstates are dual to microstates of the BTZ black hole, so the corresponding holographic calculation is a geodesic length in the black hole geometry; agreement between these two answers demonstrates that entanglement entropy thermalizes in individual microstates of holographic CFTs. For local quenches, the dual geometry is a highly boosted black hole or conical defect. On the CFT side, the rise in entanglement entropy after a quench is directly related to the monodromy of a Virasoro conformal block.

30 pages, 5 figures; v2: minor clarifications and references added

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• Holographic Local Quenches and Entanglement Density
• Effective Conformal Theory and the Flat-Space Limit of AdS
• Entanglement of low-energy excitations in Conformal Field Theory
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• Evolution of entanglement after a local quench
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