Probing the Binary Black Hole Merger Regime with Scalar Perturbations

Details Probing the Binary Black Hole Merger Regime with Scalar Perturbations Probing the Binary Black Hole Merger Regime with Scalar Perturbations

2008-01-23

arxiv.org/abs/0801.3478v1

Phys.Rev.D77:124016,2008

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

10 Pages and 6 figures

Scientific paper

10.1103/PhysRevD.77.124016

We present results obtained by scattering a scalar field off the curved background of a coalescing binary black hole system. A massless scalar field is evolved on a set of fixed backgrounds, each provided by a spatial hypersurface generated numerically during a binary black hole merger. We show that the scalar field scattered from the merger region exhibits quasinormal ringing once a common apparent horizon surrounds the two black holes. This occurs earlier than the onset of the perturbative regime as measured by the start of the quasinormal ringing in the gravitational waveforms. We also use the scalar quasinormal frequencies to associate a mass and a spin with each hypersurface, and observe the compatibility of this measure with the horizon mass and spin computed from the dynamical horizon framework.

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