The BTZ black hole with a time-dependent boundary

Details The BTZ black hole with a time-dependent boundary The BTZ black hole with a time-dependent boundary

2011-06-08

arxiv.org/abs/1106.1533v4

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

14 pages, 13 figures, title changed in journal, conformal diagrams added, references added, final version to appear in Classic

Scientific paper

The non-rotating BTZ solution is expressed in terms of coordinates that allow for an arbitrary time-dependent scale factor in the boundary metric. We provide explicit expressions for the coordinate transformation that generates this form of the metric, and determine the regions of the complete Penrose diagram that are convered by our parametrization. This construction is utilized in order to compute the stress-energy tensor of the dual CFT on a time-dependent background. We study in detail the expansion of radial null geodesic congruences in the BTZ background for various forms of the scale factor of the boundary metric. We also discuss the relevance of our construction for the holographic calculation of the entanglement entropy of the dual CFT on time-dependent backgrounds.

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