Modifications to Holographic Entanglement Entropy in Warped CFT

TL;DR

This paper explores how different boundary conditions in warped AdS3 spacetimes modify holographic entanglement entropy calculations, revealing new geometric-entanglement relations in holography beyond the standard AdS/CFT framework.

Contribution

It provides the first holographic entanglement entropy and Rényi entropy calculations for warped AdS3 with Dirichlet-Neumann boundary conditions, confirming their impact on entanglement measures.

Findings

Holographic entanglement entropy is affected by boundary conditions.

Results differ from the Ryu-Takayanagi proposal in warped geometries.

Consistent with WCFT calculations using the Rindler method.

Abstract

In arXiv:1601.02634 it was observed that asymptotic boundary conditions play an important role in the study of holographic entanglement beyond AdS/CFT. In particular, the Ryu-Takayanagi proposal must be modified for warped AdS$_3$ (WAdS$_3$) with Dirichlet boundary conditions. In this paper, we consider AdS$_3$ and WAdS$_3$ with Dirichlet-Neumann boundary conditions. The conjectured holographic duals are warped conformal field theories (WCFTs), featuring a Virasoro-Kac-Moody algebra. We provide a holographic calculation of the entanglement entropy and R\'{e}nyi entropy using AdS$_3$/WCFT and WAdS$_3$/WCFT dualities. Our bulk results are consistent with the WCFT results derived by Castro-Hofman-Iqbal using the Rindler method. Comparing with arXiv:1601.02634, we explicitly show that the holographic entanglement entropy is indeed affected by boundary conditions. Both results differ from the Ryu-Takayanagi proposal, indicating new relations between spacetime geometry and quantum entanglement for holographic dualities beyond AdS/CFT.