Orientifolded Locally AdS3 Geometries

TL;DR

This paper classifies all unorientable, stationary, axi-symmetric solutions in AdS3 Einstein gravity obtained via orientifold projections of known geometries, revealing new geometries with delta-function sources and analyzing their causal and geodesic structures.

Contribution

It introduces a comprehensive classification of orientifolded AdS3 geometries, expanding the understanding of unorientable solutions and their physical properties.

Findings

Identified four distinct types of orientifolded geometries based on the O-surface.

Demonstrated that some geometries solve Einstein equations everywhere except at the O-surface.

Analyzed the causal structure and geodesic motion in these new geometries.

Abstract

Continuing the analysis of [arXiv:1003.4089[hep-th]], we classify all locally AdS3 stationary axi-symmetric unorientable solutions to AdS3 Einstein gravity and show that they are obtained by applying certain orientifold projection on AdS3, BTZ or AdS3 self-dual orbifold, respectively O-AdS3, O-BTZ and O-SDO geometries. Depending on the orientifold fixed surface, the O-surface, which is either a space-like 2D plane or cylinder, or a light-like 2D plane or cylinder one can distinguish four distinct cases. For the space-like orientifold plane or cylinder cases these geometries solve AdS3 Einstein equations and are hence locally AdS3 everywhere except at the O-surface, where there is a delta-function source. For the light-like cases the geometry is a solution to Einstein equations even at the O-surface. We discuss the causal structure for static, extremal and general rotating O-BTZ and O-SDO cases as well as the geodesic motion on these geometries. We also discuss orientifolding Poincare patch AdS3 and AdS2 geometries as a way to geodesic completion of these spaces and comment on the 2D CFT dual to the O-geometries.