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arXiv · 1604.05308

Entanglement entropy from one-point functions in holographic states

Matthew J. S. Beach·Jaehoon Lee·Charles Rabideau·Mark Van Raamsdonk
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Abstract

For holographic CFT states near the vacuum, entanglement entropies for spatial subsystems can be expressed perturbatively as an expansion in the one-point functions of local operators dual to light bulk fields. Using the connection between quantum Fisher information for CFT states and canonical energy for the dual spacetimes, we describe a general formula for this expansion up to second-order in the one-point functions, for an arbitrary ball-shaped region, extending the first-order result given by the entanglement first law. For two-dimensional CFTs, we use this to derive a completely explicit formula for the second-order contribution to the entanglement entropy from the stress tensor. We show that this stress tensor formula can be reproduced by a direct CFT calculation for states related to the vacuum by a local conformal transformation. This result can also be reproduced via the perturbative solution to a non-linear scalar wave equation on an auxiliary de Sitter spacetime, extending the first-order result in arXiv/1509.00113.

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Matthew J. S. Beach, Jaehoon Lee, Charles Rabideau, Mark Van Raamsdonk. 2016-05-09. Entanglement entropy from one-point functions in holographic states. https://doi.org/10.1007/jhep06(2016)085

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