Binary black hole merger: symmetry and the spin expansion

Details Binary black hole merger: symmetry and the spin expansion Binary black hole merger: symmetry and the spin expansion

2007-09-04

arxiv.org/abs/0709.0299v2

Phys.Rev.Lett.100:151101,2008

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

4 pages, 4 figures, matches Phys. Rev. Lett. version

Scientific paper

10.1103/PhysRevLett.100.151101

We regard binary black hole (BBH) merger as a map from a simple initial state (two Kerr black holes, with dimensionless spins {\bf a} and {\bf b}) to a simple final state (a Kerr black hole with mass m, dimensionless spin {\bf s}, and kick velocity {\bf k}). By expanding this map around {\bf a} = {\bf b} = 0 and applying symmetry constraints, we obtain a simple formalism that is remarkably successful at explaining existing BBH simulations. It also makes detailed predictions and suggests a more efficient way of mapping the parameter space of binary black hole merger. Since we rely on symmetry rather than dynamics, our expansion complements previous analytical techniques.

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