829 research outputs found
Stability of 3D black hole with torsion
Using supersymmetric extension of the three-dimensional gravity with
torsion, we show that a generic black hole has no exact supersymmetries, the
extremal black hole has only one, while the zero-energy black hole has two.
Combining these results with the asymptotic supersymmetry algebra, we are
naturally led to interpret the zero-energy black hole as the ground state of
the Ramond sector, and analogously, the anti-de Sitter solution as the ground
state of the Neveau-Schwartz sector.Comment: LATEX, 9 page
Vaidya-like exact solutions with torsion
Starting from the Oliva--Tempo--Troncoso black hole, a solution of the
Bergshoeff--Hohm--Townsend massive gravity, a class of the Vaidya-like exact
vacuum solutions with torsion is constructed in the three-dimensional
Poincar\'e gauge theory. A particular subclass of these solutions is shown to
possess the asymptotic conformal symmetry. The related canonical energy
contains a contribution stemming from torsion.Comment: LaTeX, 15 pages, 2 figures; v2 minor revision
Poincar\'e gauge theory in 3D: canonical stability of the scalar sector
We outline the results of the canonical analysis of the three-dimensional
Poincar\'e gauge theory, defined by the general parity-invariant Lagrangian
with eight free parameters [11]. In the scalar sector, containing scalar or
pseudoscalar (A)dS modes, the stability of the canonical structure under
linearization is used to identify dynamically acceptable values of the
parameters.Comment: 6 pages, LaTeX. arXiv admin note: text overlap with arXiv:1309.041
Conserved charges in 3D gravity
The covariant canonical expression for the conserved charges, proposed by
Nester, is tested on several solutions in 3D gravity with or without torsion
and topologically massive gravity. In each of these cases, the calculated
values of energy-momentum and angular momentum are found to satisfy the first
law of black hole thermodynamics.Comment: LATEX, 14 pages; v2: minor corrections, two references adde
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