Thursday, July 18, 2013

1307.4418 (Katerina Chatziioannou et al.)

Gravitational Waveforms for Precessing, Quasicircular Compact Binaries
with Multiple Scale Analysis: Small Spin Expansion

Katerina Chatziioannou, Antoine Klein, Nicolas Yunes, Neil Cornish
We obtain analytical gravitational waveforms in the frequency-domain for precessing, quasi-circular compact binaries with small spins, applicable, for example, to binary neutron star inspirals. We begin by calculating an analytic solution to the precession equations, obtained by expanding in the dimensionless spin parameters and using multiple-scale analysis to separate timescales. We proceed by analytically computing the Fourier transform of time-domain waveform through the stationary phase approximation. We show that the latter is valid for systems with small spins. Finally, we show that these waveforms have a high overlap with numerical waveforms obtained through direct integration of the precession equations and discrete Fourier transformations. The resulting, analytic waveform family is ideal for detection and parameter estimation of gravitational waves emitted by inspiraling binary neutron stars with ground-based detectors.
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