Boundary stress tensor and asymptotically AdS3 non-Einstein spaces at the chiral point

TL;DR

This paper explores non-Einstein solutions in chiral gravity and extended theories, revealing new non-locally AdS3 geometries with vanishing conserved charges, relevant for understanding quantum aspects of the theory.

Contribution

It demonstrates the persistence and emergence of non-locally AdS3 solutions in chiral gravity extended by higher-curvature terms, expanding the landscape of known solutions.

Findings

Non-Einstein solutions exist in chiral gravity and persist under higher-curvature deformations.

New non-locally AdS3 solutions appear with no TMG analogues when higher-curvature terms are added.

These solutions have vanishing conserved charges, indicating special physical properties.

Abstract

Chiral gravity admits asymptotically AdS3 solutions that are not locally equivalent to AdS3; meaning that solutions do exist which, while obeying the strong boundary conditions usually imposed in General Relativity, happen not to be Einstein spaces. In Topologically Massive Gravity (TMG), the existence of non-Einstein solutions is particularly connected to the question about the role played by complex saddle points in the Euclidean path integral. Consequently, studying (the existence of) non-locally AdS3 solutions to chiral gravity is relevant to understand the quantum theory. Here, we discuss a special family of non-locally AdS3 solutions to chiral gravity. In particular, we show that such solutions persist when one deforms the theory by adding the higher-curvature terms of the so-called New Massive Gravity (NMG). Moreover, the addition of higher-curvature terms to the gravity action introduces new non-locally AdS3 solutions that have no analogues in TMG. Both stationary and time-dependent, axially symmetric solutions that asymptote AdS3 space without being locally equivalent to it appear. Defining the boundary stress-tensor for the full theory, we show that these non-Einstein geometries have associated vanishing conserved charges.