Ergoregion instability of ultra-compact astrophysical objects

Vitor Cardoso , Paolo Pani , Mariano Cadoni , Marco Cavaglia

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classification 🌀 gr-qc astro-phhep-ph

keywords objectsinstabilityergoregionultra-compactblackeventsgravitational-waveholes

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Most of the properties of black holes can be mimicked by horizonless compact objects such as gravastars and boson stars. We show that these ultra-compact objects develop a strong ergoregion instability when rapidly spinning. Instability timescales can be of the order of 0.1 seconds to 1 week for objects with mass M=1-10^6 solar masses and angular momentum J> 0.4 M^2. This provides a strong indication that ultra-compact objects with large rotation are black holes. Explosive events due to ergoregion instability have a well-defined gravitational-wave signature. These events could be detected by next-generation gravitational-wave detectors such as Advanced LIGO or LISA.

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Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.

Testing the nature of dark compact objects: a status report
gr-qc 2019-04 accept novelty 2.0

Current and future observations can test whether dark compact objects are Kerr black holes or exotic alternatives, with null results strengthening the black hole paradigm.