Gravitational instabilities of superspinars

Details Gravitational instabilities of superspinars Gravitational instabilities of superspinars

2010-06-09

arxiv.org/abs/1006.1863v3

Phys. Rev. D 82, 044009 (2010)

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

15 pages, 9 figures, 1 table. v2: Fig. 8 and Section I improved. v3: minor changes to match the published version

Scientific paper

10.1103/PhysRevD.82.044009

Superspinars are ultracompact objects whose mass M and angular momentum J violate the Kerr bound (cJ/GM^2>1). Recent studies analyzed the observable consequences of gravitational lensing and accretion around superspinars in astrophysical scenarios. In this paper we investigate the dynamical stability of superspinars to gravitational perturbations, considering either purely reflecting or perfectly absorbing boundary conditions at the "surface" of the superspinar. We find that these objects are unstable independently of the boundary conditions, and that the instability is strongest for relatively small values of the spin. Also, we give a physical interpretation of the various instabilities that we find. Our results (together with the well-known fact that accretion tends to spin superspinars down) imply that superspinars are very unlikely astrophysical alternatives to black holes.

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