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Black hole superradiance in dynamical spacetime

Author(s): East, William E; Ramazanoglu, Fethi M; Pretorius, Frans

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Abstract: We study the superradiant scattering of gravitational waves by a nearly extremal black hole (dimensionless spin a = 0.99) by numerically solving the full Einstein field equations, thus including backreaction effects. This allows us to study the dynamics of the black hole as it loses energy and angular momentum during the scattering process. To explore the nonlinear phase of the interaction, we consider gravitational wave packets with initial energies up to 10% of the mass of the black hole. We find that as the incident wave energy increases, the amplification of the scattered waves, as well as the energy extraction efficiency from the black hole, is reduced. During the interaction the apparent horizon geometry undergoes sizable nonaxisymmetric oscillations. The largest amplitude excitations occur when the peak frequency of the incident wave packet is above where superradiance occurs, but close to the dominant quasinormal mode frequency of the black hole.
Publication Date: 15-Mar-2014
Electronic Publication Date: 20-Mar-2014
Citation: East, William E, Ramazanoglu, Fethi M, Pretorius, Frans. (2014). Black hole superradiance in dynamical spacetime. PHYSICAL REVIEW D, 89 (10.1103/PhysRevD.89.061503
DOI: doi:10.1103/PhysRevD.89.061503
ISSN: 1550-7998
EISSN: 1550-2368
Type of Material: Journal Article
Journal/Proceeding Title: PHYSICAL REVIEW D
Version: Final published version. Article is made available in OAR by the publisher's permission or policy.

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