Constraints on the Maximum Densities of Neutron Stars from Postmerger Gravitational Waves with ThirdGeneration Observations
Abstract
Using data from 289 numerical relativity simulations of binary neutron star mergers, 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 ∼15 % (90% credibility 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 a 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% credibility level).
 Publication:

Physical Review Letters
 Pub Date:
 April 2022
 DOI:
 10.1103/PhysRevLett.128.161102
 arXiv:
 arXiv:2110.06957
 Bibcode:
 2022PhRvL.128p1102B
 Keywords:

 General Relativity and Quantum Cosmology;
 Astrophysics  High Energy Astrophysical Phenomena
 EPrint:
 doi:10.1103/PhysRevLett.128.161102