Where are all the gravastars? Limits upon the gravastar model from accreting black holes

Details Where are all the gravastars? Limits upon the gravastar model from accreting black holes Where are all the gravastars? Limits upon the gravastar model from accreting black holes

2007-01-29

arxiv.org/abs/gr-qc/0701154v1

Class.Quant.Grav.24:659-666,2007

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

11 pages, 4 figures

Scientific paper

10.1088/0264-9381/24/3/009

The gravastar model, which postulates a strongly correlated thin shell of anisotropic matter surrounding a region of anti-de Sitter space, has been proposed as an alternative to black holes. We discuss constraints that present-day observations of well-known black hole candidates place on this model. We focus upon two black hole candidates known to have extraordinarily low luminosities: the supermassive black hole in the Galactic Center, Sagittarius A*, and the stellar-mass black hole, XTE J1118+480. We find that the length scale for modifications of the type discussed in Chapline et al. (2003) must be sub-Planckian.

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