Ajith, P. (2011) Addressing the spin question in gravitational-wave searches: Waveform templates for inspiralling compact binaries with nonprecessing spins. Physical Review D, 84 (8). Art. No. 084037. ISSN 0556-2821 http://resolver.caltech.edu/CaltechAUTHORS:20111205-111513859
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This paper presents a post-Newtonian (PN) template family of gravitational waveforms from inspiralling compact binaries with nonprecessing spins, where the spin effects are described by a single “reduced-spin” parameter. This template family, which reparametrizes all the spin-dependent PN terms in terms of the leading-order (1.5PN) spin-orbit coupling term in an approximate way, has very high overlaps (fitting factor >0.99) with nonprecessing binaries with arbitrary mass ratios and spins. We also show that this template family is “effectual” for the detection of a significant fraction of generic spinning binaries in the comparable-mass regime (m_2/m_1≲10), providing an attractive and feasible way of searching for gravitational waves from spinning low-mass binaries. We also show that the secular (nonoscillatory) spin-dependent effects in the phase evolution (which are taken into account by the nonprecessing templates) are more important than the oscillatory effects of precession in the comparable-mass (m_1≃m_2) regime. Hence the effectualness of nonspinning templates is particularly poor in this case, as compared to non-precessing-spin templates. For the case of binary neutron stars observable by Advanced LIGO, even moderate spins (L̂_N·S/m^2≃0.015–0.1) will cause considerable mismatches (~3%–25%) with nonspinning templates. This is contrary to the expectation that neutron-star spins may not be relevant for gravitational wave detection.
|Additional Information:||© 2011 American Physical Society. Received 8 July 2011; published 17 October 2011. I would like to thank K. G. Arun, Duncan Brown, Alessandra Buonanno, Yanbei Chen, Stephen Fairhurst, Marc Favata, Mark Hannam, Sascha Husa, Andrew Lundgren, Cole Miller, Evan Ochsner, Frank Ohme, Yi Pan, B. S. Sathyaprakash, and Alan Weinstein for useful discussions and comments, and Priyanka Nayar for proofreading the manuscript. This work is supported by the LIGO Laboratory, NSF Grants No. PHY-0653653 and No. PHY-0601459, NSF Career Grant No. PHY-0956189, and the David and Barbara Groce Fund at Caltech. LIGO was constructed by the California Institute of Technology and Massachusetts Institute of Technology with funding from the National Science Foundation and operates under Cooperative Agreement No. PHY-0757058. This paper has the LIGO Document No. LIGO-P1100075-v4.|
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|Classification Code:||PACS: 04.25.Nx, 04.30.Db|
|Official Citation:||Addressing the spin question in gravitational-wave searches: Waveform templates for inspiralling compact binaries with nonprecessing spins P. Ajith Published 17 October 2011 (17 pages) 084037|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Ruth Sustaita|
|Deposited On:||05 Dec 2011 19:37|
|Last Modified:||26 Dec 2012 14:33|
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