Gravitational perturbation of the BTZ black hole induced by test particles and weak cosmic censorship in AdS spacetime

Details Gravitational perturbation of the BTZ black hole induced by test particles and weak cosmic censorship in AdS spacetime Gravitational perturbation of the BTZ black hole induced by test particles and weak cosmic censorship in AdS spacetime

2011-02-21

arxiv.org/abs/1102.4352v2

Phys.Rev.D83:104037,2011

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

6 pages, no figures; v2: minor corrections and reference added to match published version

Scientific paper

10.1103/PhysRevD.83.104037

We analyze the gravitational perturbations induced by particles falling into a three dimensional, asymptotically AdS black hole geometry. More specifically, we solve the linearized perturbation equations obtained from the geodesic motion of a ring-like distribution of test particles in the BTZ background. This setup ensures that the U(1) symmetry of the background is preserved. The non-asymptotic flatness of the background raises difficulties in attributing the significance of energy and angular momentum to the conserved quantities of the test particles. This issue is well known but, to the best of our knowledge, has never been addressed in the literature. We confirm that the naive expressions for energy and angular momentum are the correct definitions. Finally, we put an asymptotically AdS version of the weak cosmic censorship to a test: by attempting to overspin the BTZ black hole with test particles it is found that the black hole cannot be spun-up past its extremal limit.

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