Tidal acceleration of black holes and superradiance
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Tidal acceleration of black holes and superradiance. / Cardoso, Vitor; Pani, Paolo.
I: Classical and Quantum Gravity, Bind 30, Nr. 4, 045011, 21.02.2013.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - Tidal acceleration of black holes and superradiance
AU - Cardoso, Vitor
AU - Pani, Paolo
PY - 2013/2/21
Y1 - 2013/2/21
N2 - Tidal effects have long ago locked the Moon in a synchronous rotation with the Earth and progressively increase the Earth-Moon distance. This 'tidal acceleration' hinges on dissipation. Binaries containing black holes may also be tidally accelerated, dissipation being caused by the event horizon-a flexible, viscous one-way membrane. In fact, this process is known for many years under a different guise: superradiance. Here, we provide compelling evidence for a strong connection between tidal acceleration and superradiant scattering around spinning black holes. In general relativity, tidal acceleration is obscured by the gravitational-wave emission. However, when coupling to light scalar degrees of freedom is allowed, an induced dipole moment produces a 'polarization acceleration', which might be orders of magnitude stronger than tidal quadrupolar effects. Consequences for optical and gravitational-wave observations are intriguing and it is not impossible that imprints of such a mechanism have already been observed.
AB - Tidal effects have long ago locked the Moon in a synchronous rotation with the Earth and progressively increase the Earth-Moon distance. This 'tidal acceleration' hinges on dissipation. Binaries containing black holes may also be tidally accelerated, dissipation being caused by the event horizon-a flexible, viscous one-way membrane. In fact, this process is known for many years under a different guise: superradiance. Here, we provide compelling evidence for a strong connection between tidal acceleration and superradiant scattering around spinning black holes. In general relativity, tidal acceleration is obscured by the gravitational-wave emission. However, when coupling to light scalar degrees of freedom is allowed, an induced dipole moment produces a 'polarization acceleration', which might be orders of magnitude stronger than tidal quadrupolar effects. Consequences for optical and gravitational-wave observations are intriguing and it is not impossible that imprints of such a mechanism have already been observed.
KW - WAVES
U2 - 10.1088/0264-9381/30/4/045011
DO - 10.1088/0264-9381/30/4/045011
M3 - Journal article
VL - 30
JO - Classical and Quantum Gravity
JF - Classical and Quantum Gravity
SN - 0264-9381
IS - 4
M1 - 045011
ER -
ID: 300166921