Schmidt, Patricia, Hannam, Mark  ORCID: https://orcid.org/0000-0001-5571-325X and Husa, Sascha
2012.
Towards models of gravitational waveforms from generic binaries: A simple approximate mapping between precessing and nonprecessing inspiral signals.
Physical Review D
86
(10)
, 104063 (.
10.1103/PhysRevD.86.104063
|
Abstract
One of the greatest theoretical challenges in the buildup to the era of second-generation gravitational-wave detectors is the modeling of generic binary waveforms. We introduce an approximation that has the potential to significantly simplify this problem. We show that generic precessing-binary inspiral waveforms (covering a seven-dimensional space of intrinsic parameters) can be mapped to a two-dimensional space of nonprecessing binaries, characterized by the mass ratio and a single effective total spin. The mapping consists of a time-dependent rotation of the waveforms into the quadrupole-aligned frame and is extremely accurate (matches >0.99 with parameter biases in the total spin of Δχ≤0.04), even in the case of transitional precession. In addition, we demonstrate a simple method to construct hybrid post-Newtonian–numerical relativity precessing-binary waveforms in the quadrupole-aligned frame and provide evidence that our approximate mapping can be used all the way to the merger. Finally, based on these results, we outline a general proposal for the construction of generic waveform models, which will be the focus of future work.
| Item Type: | Article |
|---|---|
| Date Type: | Publication |
| Status: | Published |
| Schools: | Physics and Astronomy |
| Subjects: | Q Science > QC Physics |
| Publisher: | American Physical Society |
| ISSN: | 1550-7998 |
| Last Modified: | 24 Oct 2022 10:57 |
| URI: | https://orca.cardiff.ac.uk/id/eprint/46523 |
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