Ergoregion instability of ultra-compact astrophysical objects

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dc.creatorCardoso, Vitor
dc.creatorPani, Paolo
dc.creatorCadoni, Mariano
dc.creatorCavaglia, Marco
dc.date2007-09-04
dc.date2008-07-04
dc.date.accessioned2026-07-07T11:42:14Z
dc.date.available2026-07-07T11:42:14Z
dc.descriptionMost 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.
dc.description14 pages, 8 Figures, 6 Tables. RevTeX4. v2: Shortened version, published on PRD, focused on gravastars and boson stars. Sections on wormholes and superspinars will appear elsewhere
dc.identifierhttps://arxiv.org/abs/0709.0532
dc.identifierhttp://arxiv.org/abs/0709.0532
dc.identifierPhys.Rev.D77:124044,2008
dc.identifierdoi:10.1103/PhysRevD.77.124044
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/200814
dc.subjectGeneral Relativity and Quantum Cosmology
dc.subjectAstrophysics
dc.subjectHigh Energy Physics - Phenomenology
dc.titleErgoregion instability of ultra-compact astrophysical objects
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