Ergoregion instability of black hole mimickers

Marco Cavaglia; Mariano Cadoni; Paolo Pani; Vitor Cardoso

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arxiv 0901.0850 v2 pith:I6HL4VXG submitted 2009-01-07 gr-qc

Ergoregion instability of black hole mimickers

Paolo Pani , Vitor Cardoso , Mariano Cadoni , Marco Cavaglia This is my paper

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keywords blackinstabilityergoregionholeholesmimickersobjectsrange

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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^-5 s and 1 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.

Ergoregion instability of black hole mimickers

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