Polarization of Long-Wavelength Gravitational Waves by Rotating Black Holes

Details Polarization of Long-Wavelength Gravitational Waves by Rotating Black Holes Polarization of Long-Wavelength Gravitational Waves by Rotating Black Holes

2008-05-08

arxiv.org/abs/0805.1236v2

Class. Quantum Grav. 25 (2008) 235002

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

12 pages, no figures. Now incorporated into arXiv:0801.3805 and journal article Class. Quantum Grav. 25 (2008) 235002

Scientific paper

The scattering cross section for a long-wavelength planar gravitational wave impinging upon a rotating black hole is calculated, for the special case in which the direction of incidence is aligned with the rotation axis. We show that black hole rotation leads to a term in the cross section that is proportional to $a\omega$. Hence, contrary to some claims, co-rotating and counter-rotating helicities are scattered differently, and a partial polarization is induced in an unpolarized incident wave. The scattering amplitudes are found via partial wave series. To compute the series, two ingredients are required: phase shifts and spin-weighted spheroidal harmonics. We show that the phase shifts may be found from low-frequency solutions of the radial Teukolsky equation derived by Mano, Suzuki and Takasugi. The spheroidal harmonics may be expanded in spherical harmonics; we present expansions accurate to second order in $a \omega$. The two ingredients are combined to give explicit expressions for the helicity-conserving and helicity-reversing amplitudes, valid in the long-wavelength limit.

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