Conserved charges in timelike Warped-AdS$_3$ spaces

TL;DR

This paper studies conserved charges in timelike Warped-AdS$_3$ spaces within New Massive Gravity, analyzing spinning defects and their energy and angular momentum, and exploring the asymptotic symmetries of these geometries.

Contribution

It introduces a method to compute conserved charges for spinning defects in timelike WAdS$_3$ spaces using covariant formalism and quasi-local stress-tensor within NMG, including special limits and symmetry analysis.

Findings

Defined quasi-local energy for defects beyond CTC regions.

Computed mass and angular momentum of spinning particles in WAdS$_3$.

Discussed asymptotic symmetry algebra of WAdS$_3$ in NMG.

Abstract

We consider the timelike version of Warped Anti-de Sitter space (WAdS), which corresponds to the three-dimensional section of the G\"{o}del solution of four-dimensional cosmological Einstein equations. This geometry presents closed timelike curves (CTCs), which are inherited from its four-dimensional embedding. In three dimensions, this type of solutions can be supported without matter provided the graviton acquires mass. Here, among the different ways to consistenly give mass to the graviton in three dimensions, we consider the parity-even model known as New Massive Gravity (NMG). In the bulk of timelike WAdS$_{3}$ space, we introduce defects that, from the three-dimensional point of view, represent spinning massive particle-like objects. For this type of sources, we investigate the definition of quasi-local gravitational energy as seen from infinity, far beyond the region where the CTCs appear. We also consider the covariant formalism applied to NMG to compute the mass and the angular momentum of spinning particle-like defects, and compare the result with the one obtained by means of the quasi-local stress-tensor. We apply these methods to special limits in which the WAdS$_3$ solutions coincide with locally AdS$_3$ and locally AdS$_{2}\times \mathbb{R}$ spaces. Finally, we make some comments about the asymptotic symmetry algebra of asymptotically WAdS$_3$ spaces in NMG.