Authors: Michael Pürrer1, P. Ajith2,3, Mark Hannam1, Sascha Husa4
1School of Physics and Astronomy, Cardiff University, Queens Building, CF24 3AA, Cardiff, United Kingdom
2LIGO Laboratory, California Institute of Technology, Pasadena, CA 91125, USA
3Theoretical Astrophysics, California Institute of Technology, Pasadena, CA 91125, USA
4Departament de Fisica, Universitat de les Illes Balears, Crta. Valldemossa km 7.5, E-07122 Palma, Spain
An effective spin parameter allows us to capture the dominant spin effects in compact binary coalescences, while reducing the number of physical parameters in a waveform model. An effective-spin PN inspiral model has been shown to be both effectual and faithful, and a similar parameter has also been used in recent phenomenological inspiral-merger-ringdown (IMR) models for black-hole binaries. While the use of such an approximation is well motivated by post-Newtonian theory, its validity has not yet been tested on full IMR waveforms. We present the results of a study aimed at quantifying that validity.
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