Gravitational waveforms for compact binary coalescences (CBCs) have been invaluable for detections by the LIGO-Virgo collaboration. They are obtained by a combination of semi-analytical models and numerical simulations. So far systematic errors arising from these procedures appear to be less than statistical ones. However, the significantly enhanced sensitivity of the new detectors that will become operational in the near future will require waveforms to be much more accurate. This task would be facilitated if one has a variety of cross-checks to \emph{evaluate} accuracy, particularly in the regions of parameter space where numerical simulations are sparse. Currently errors are estimated by comparing the candidate waveforms with the numerical relativity (NR) ones, which are taken to be exact. The goal of this paper is to propose a qualitatively different tool. We show that full non-linear general relativity (GR) imposes an infinite number of sharp constraints on the CBC waveforms. These can provide clear-cut measures to evaluate the accuracy of candidate waveforms against exact GR, help find systematic errors, and also provide external checks on NR simulations themselves.
@article{arxiv.1906.00913,
title = {Compact binary coalescences: Constraints on waveforms},
author = {Abhay Ashtekar and Tommaso De Lorenzo and Neev Khera},
journal= {arXiv preprint arXiv:1906.00913},
year = {2021}
}
Comments
25 pages, 1 figure. The main results are the same as in V1. Focus of the article improved by expanding the material addressed to the waveform community and dropping the one primarily addressed to mathematical relativists. Discussion updated in view of new results of [46] - [48]