Showing papers by "Tadashi Takayanagi published in 2022"
TL;DR: In this article , the authors study holographic entanglement entropy in dS/CFTs and introduce timelike entenglement entropy for CFTs via an analytical continuation, and they argue that the imaginary part of pseudoentropy implies an emergence of time.
Abstract: We study holographic entanglement entropy in dS/CFT and introduce timelike entanglement entropy in CFTs. Both of them take complex values in general and are related with each other via an analytical continuation. We argue that they are correctly understood as pseudoentropy. We find that the imaginary part of pseudoentropy implies an emergence of time in dS/CFT.
21 citations
DOI•
14 Jul 2022
TL;DR: In this article , the authors studied codimension two holography in spacetimes, based on the idea of the wedge holographicy, and showed that a region in a d + 1 dimensional flat spacetime surrounded by two end-branes, which are given by d dimensional hyperbolic spaces, is dual to a conformal theory (CFT) on a d − 1 dimensional sphere.
Abstract: In this paper, we study codimension two holography in flat spacetimes, based on the idea of the wedge holography. We propose that a region in a d + 1 dimensional flat spacetime surrounded by two end of the world-branes, which are given by d dimensional hyperbolic spaces, is dual to a conformal field theory (CFT) on a d − 1 dimensional sphere. Similarly, we also propose that a d +1 dimensional region in the flat spacetime bounded by two d dimensional de Sitter spaces is holographically dual to a CFT on a d − 1 dimensional sphere. Our calculations of the partition function, holographic entanglement entropy and two point functions, support these duality relations and imply that such CFTs are non-unitary. Finally, we glue these two dualities along null surfaces to realize a codimension two holography for a full Minkowski spacetime and discuss a possible connection to the celestial holography.
5 citations