Bulk entanglement entropy in perturbative excited states
Abstract
We compute the bulk entanglement entropy across the Ryu-Takayanagi surface for a one-particle state in a scalar field theory in AdS. We work directly within the bulk Hilbert space and include the spatial spread of the scalar wavefunction. We give closed form expressions in the limit of small interval sizes and compare the result to a CFT computation of entanglement entropy in an excited primary state at large . Including the contribution from the backreacted minimal area, we find agreement between the CFT result and the FLM and JLMS formulas for quantum corrections to holographic entanglement entropy. This provides a non-trivial check in a state where the answer is not dictated by symmetry. Along the way, we provide closed-form expressions for the scalar field Bogoliubov coefficients that relate the global and Rindler slicings of AdS.
Keywords
Cite
@article{arxiv.1805.08782,
title = {Bulk entanglement entropy in perturbative excited states},
author = {Alexandre Belin and Nabil Iqbal and Sagar F. Lokhande},
journal= {arXiv preprint arXiv:1805.08782},
year = {2018}
}
Comments
35 pages, 5 figures; v2 references added; v3: Typos corrected, as requested by a SciPost Physics referee. The referee report can be found at https://scipost.org/submission/1805.08782v2/