Analytic Continuation for Asymptotically AdS 3D Gravity

TL;DR

This paper extends the analytic continuation method for asymptotically AdS 3D spacetimes to include rotating wormholes, linking their Lorentzian and Euclidean geometries through hyperbolic quotients and moduli parameters.

Contribution

It generalizes the analytic continuation procedure to rotating cases, relating angular velocity to Fenchel-Nielsen twists and classifying black holes and wormholes via boundary moduli.

Findings

Rotating wormholes correspond to quotients of hyperbolic space by quasi-Fuchsian groups.

Angular velocity is related to Fenchel-Nielsen twist parameters.

Spacetimes are classified by boundary moduli of their Euclidean counterparts.

Abstract

We have previously proposed that asymptotically AdS 3D wormholes and black holes can be analytically continued to the Euclidean signature. The analytic continuation procedure was described for non-rotating spacetimes, for which a plane t=0 of time symmetry exists. The resulting Euclidean manifolds turned out to be handlebodies whose boundary is the Schottky double of the geometry of the t=0 plane. In the present paper we generalize this analytic continuation map to the case of rotating wormholes. The Euclidean manifolds we obtain are quotients of the hyperbolic space by a certain quasi-Fuchsian group. The group is the Fenchel-Nielsen deformation of the group of the non-rotating spacetime. The angular velocity of an asymptotic region is shown to be related to the Fenchel-Nielsen twist. This solves the problem of classification of rotating black holes and wormholes in 2+1 dimensions: the spacetimes are parametrized by the moduli of the boundary of the corresponding Euclidean spaces. We also comment on the thermodynamics of the wormhole spacetimes.