Entanglement entropy from one-point functions in holographic states

Apr 18, 2016
32 pages
Published in:
  • JHEP 06 (2016) 085
  • Published: Jun 15, 2016
e-Print:

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Abstract: (Springer)
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 .
Note:
  • 34 pages, 2 figures; v2 references added, minor typos corrected
  • AdS-CFT Correspondence
  • Gauge-gravity correspondence
  • entropy: entanglement
  • transformation: conformal
  • space-time: de Sitter
  • operator: local
  • duality: holography
  • nonlinear
  • field theory: conformal
  • n-point function: 1