Constraints on the maximum densities of neutron stars from postmerger gravitational waves with third-generation observations

Matteo Breschi; Sebastiano Bernuzzi; Daniel Godzieba; Albino Perego; David Radice

doi:10.1103/PhysRevLett.128.161102

paper

Constraints on the maximum densities of neutron stars from postmerger gravitational waves with third-generation observations

arXiv:2110.06957 · doi:10.1103/PhysRevLett.128.161102

Abstract

Using data from 289 numerical relativity simulations of merging binary neutron stars, we identify, for the first time, a robust quasi-universal relation connecting the postmerger peak gravitational-wave frequency and the value of the density at the center of the maximum mass nonrotating neutron star. This relation offers a new possibility for precision equation-of-state constraints with next-generation ground-based gravitational-wave interferometers. Mock Einstein Telescope observations of fiducial events indicate that Bayesian inferences can constrain the maximum density to $\sim 15%$ ( $90%$ confidence level) for a single signal at the minimum sensitivity threshold for a detection. If the postmerger signal is included in a full-spectrum (inspiral-merger-postmerger) analysis of such signal, the pressure-density function can be tightly constrained up to the maximum density, and the maximum neutron star mass can be measured with an accuracy better than $12%$ ( $90%$ confidence level).

Constraints on the maximum densities of neutron stars from postmerger gravitational waves with third-generation observations

Abstract

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