Ultra-compact, horizonless objects such as gravastars, boson stars, wormholes and superspinars can mimick most of the properties of black holes. Here we show that these "black hole mimickers" will most likely develop a strong ergoregion instability when rapidly spinning. Instability timescales range between ∼ 10-5s and ∼ weeks depending on the object, its mass and its angular momentum. For a wide range of parameters the instability is truly effective. This provides a strong indication that astrophysical ultra-compact objects with large rotation are black holes.
P. Pani et al., "Ergoregion Instability of Black Hole Mimickers," Proceedings of Science, Sissa Medialab, Aug 2008.
The definitive version is available at https://doi.org/10.22323/1.075.0027
Black Holes in General Relativity and String Theory (2008: Aug. 24-30, Veli Lošinj, Croatia)
FCT (Fundação para a Ciência e Tecnologia)
National Science Foundation (U.S.)
Keywords and Phrases
Black holes; Large rotation; Most likely; Time-scales; Relativity; Stability; Stars; String theory; Gravitation
International Standard Serial Number (ISSN)
Article - Conference proceedings
© 2008 Sissa Medialab, All rights reserved.
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01 Aug 2008