Constraints on the neutron star's maximum densities from postmerger gravitationalwaves with thirdgeneration observations
Abstract
Using data from 289 numerical relativity simulations of merging binary neutron stars, we identify, for the first time, a robust quasiuniversal relation connecting the postmerger peak gravitationalwave 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 equationofstate constraints with nextgeneration groundbased gravitationalwave 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 fullspectrum (inspiralmergerpostmerger) analysis of such signal, the pressuredensity 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).
 Publication:

arXiv eprints
 Pub Date:
 October 2021
 arXiv:
 arXiv:2110.06957
 Bibcode:
 2021arXiv211006957B
 Keywords:

 General Relativity and Quantum Cosmology;
 Astrophysics  High Energy Astrophysical Phenomena