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On the stability of a superspinar · Around

2017

On the stability of a superspinar

Nakao, Ken-ichi, Joshi, Pankaj S., Guo, Jun-Qi et al.

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Understand

The superspinar proposed by Gimon and Horava is a rapidly rotating compact entity whose exterior is described by the over-spinning Kerr geometry.

The compact entity itself is expected to be governed by superstringy effects, and in astrophysical scenarios it can give rise to interesting observable phenomena.
Earlier it was suggested that the superspinar may not be stable but we point out here that this does not necessarily follow from earlier studies.
We show, by analytically treating the Teukolsky equations by Detwiler's method, that in fact there are infinitely many boundary conditions that make the superspinar stable, and that the modes will decay in time.

Built on

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S.A. Teukolsky and W.H. Press, Astrophys. J. 193
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A.A. Starobinski and S.M. Churilov, JETP 38
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J.L. Friedman, Commun. Math. Phys. 63
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N. Comins and B.F. Schutz, Proc. R. Soc. Lond. A 364
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Similar

S. Detweiler, Astrophys. J. 239
1980
Cited alongside, same era.
M. Sasaki and T. Nakamura, Gen. Relativ. Gravit. 22
1990
Cited alongside, same era.
V. Cardoso, Phys. Rev. D 70
2004
Cited alongside, same era.
G. Dotti, R. Gleiser, and J. Pullin, Phys. Lett. B 644
2007
Cited alongside, same era.

Then

G. Dotti, R.J. Gleiser, I.F. Ranea-Sandoval, and H. Vucetich, Classical Quantum Gravity 25
2008
Later among the works it cites.
V. Cardoso, P. Pani, M. Cadoni, and M. Cavaglia, Classical Quantum Gravity 25
2008
Later among the works it cites.
E. G. Gimon and P. Ho r ˇ \check{\rm r} ava, Phys. Lett. B 672, 299 (2009). [0706.2878]
2009
Later among the works it cites.
P. Pani, E. Barausse, E. Berti and V. Cardoso, Phys. Rev. D 82
2010
Later among the works it cites.

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