Abstract
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.
Recommended Citation
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
Meeting Name
Black Holes in General Relativity and String Theory (2008: Aug. 24-30, Veli Lošinj, Croatia)
Department(s)
Physics
Sponsor(s)
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)
1824-8039
Document Type
Article - Conference proceedings
Document Version
Final Version
File Type
text
Language(s)
English
Rights
© 2008 Sissa Medialab, All rights reserved.
Creative Commons Licensing
This work is licensed under a Creative Commons Attribution-Share Alike 4.0 License.
Publication Date
01 Aug 2008
Comments
This work is supported by Fundação para a Ciência e Tecnologia (FCT) - Portugal through project PTDC/FIS/64175/2006 and by the National Science Foundation through LIGO Research Support grant NSF PHY-0757937.