Year: 2025
Type: preprint
Abstract: Mounting evidence indicates that some of the gravitational wave signals observed by the LIGO/Virgo/KAGRA observatories might arise from eccentric compact object binaries, increasing the urgency for accurate waveform models for such systems. While for non-eccentric binaries, surrogate models are efficient and accurate, the additional features due to eccentricity have posed a challenge. In this letter, we present a novel method for decomposing eccentric numerical relativity waveforms which makes them amenable to surrogate modelling techniques. We parameterize the inspiral in the radial phase domain, factoring out eccentricity-induced dephasing and thus enhancing compressibility and accuracy. This is combined with a second surrogate for the merger-ringdown in the time-domain and a novel technique to take advantage of the approximate periodicity with radial oscillations during the inspiral. We apply this procedure to the $(2,2)$ mode for non-spinning black hole binaries, and demonstrate that the resulting surrogate, NRSurE_q4NoSpin_22, is able to faithfully reproduce the underlying numerical relativity waveforms, with maximum mismatches of $5\times10^{-4}$ and median mismatches of $2\times10^{-5}$. This technique paves the way for high-accuracy parameter estimation with eccentric models, a key ingredient for astrophysical inference and tests of general relativity.
Source: arXiv (Cornell University)
Authors: Nee, Peter James, Ravichandran, Adhrit, Field, Scott E., Islam, Tousif, Pfeiffer, Harald P., Varma, Vijay, Boyle, Michael, Ceja, Andrea, Ghadiri, Noora, Kidder, Lawrence E., Kumar, Prayush, Maurya, Akash, Morales, Marlo, Ramos-Buades, Antoni, Ravishankar, Abhishek, Rink, Katie, Rüter, Hannes R., Scheel, Mark A., Shaikh, Md Arif, Tellez, Daniel
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W7084626033
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