Holographic Entanglement Entropy in the FLRW Universe

Abstract

We compute a holographic entanglement entropy via Ryu--Takayanagi prescription in the three-dimensional Friedmann--Lemaître--Robertson--Walker universe. We consider two types of holographic scenarios analogous to the static patch holography and the half de Sitter holography, in which the holographic boundary is timelike and placed in the bulk. We find in general that the strong subadditivity can be satisfied only in the former type and in addition the holographic boundary has to fit inside the apparent horizon. Also, for the universe filled with an ideal fluid of constant equation of state $w<-1$, the condition is sharpened as that the holographic boundary has to fit inside the event horizon instead. These conditions provide a necessary condition for the dual quantum field theory to be standard and compatible with the strong subadditivity.

34 pages. Ver.2: published in JHEP

References in corpus (8)

• A holographic proof of the strong subadditivity of entanglement entropy
• Consistency condition for inflation from (broken) conformal symmetry
• Non-Gaussian Inflationary Perturbations from the dS/CFT Correspondence
• Symmetry Constraints in Inflation, $\alpha$-vacua, and the Three Point Function
• Spacetime Equals Entanglement
• Black hole to cosmic horizon microstates in string/M theory: timelike boundaries and internal averaging
• Closed FRW holography: A time-dependent ER=EPR realization
• Horizon causality from holographic scattering in asymptotically dS${}_3$

Cited by in corpus (3)

• Bulk Reconstruction of Scalar Excitations in Flat${}_3$/CCFT${}_2$ and the Flat Limit from (A)dS${}_3$/CFT${}_2$
• Entanglement Entropy and Complexity of Multicomponent Universe from Holography
• Holography for de Sitter bubble geometries