What Can We Learn about the Unstable Equation-of-state Branch from Neutron Star Mergers?

Ujevic, Maximiliano; Somasundaram, Rahul; Dietrich, Tim; Margueron, Jerome; Tews, Ingo

doi:10.3847/2041-8213/ad2072

Title: What Can We Learn about the Unstable Equation-of-state Branch from Neutron Star Mergers?

Journal Article · Thu Feb 01 00:00:00 EST 2024 · The Astrophysical Journal. Letters

DOI:https://doi.org/10.3847/2041-8213/ad2072· OSTI ID:2283596

;

; Margueron, Jerome;

Abstract The equation of state (EOS) of dense strongly interacting matter can be probed by astrophysical observations of neutron stars (NS), such as X-ray detections of pulsars or the measurement of the tidal deformability of NSs during the inspiral stage of NS mergers. These observations constrain the EOS at most up to the density of the maximum-mass configuration, n _TOV , which is the highest density that can be explored by stable NSs for a given EOS. However, under the right circumstances, binary neutron star (BNS) mergers can create a postmerger remnant that explores densities above n _TOV . In this work, we explore whether the EOS above n _TOV can be measured from gravitational-wave or electromagnetic observations of the postmerger remnant. We perform a total of 25 numerical-relativity simulations of BNS mergers for a range of EOSs and find no case in which different descriptions of the matter above n _TOV have a detectable impact on postmerger observables. Hence, we conclude that the EOS above n _TOV can likely not be probed through BNS merger observations for the current and next generation of detectors.

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Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Nuclear Physics (NP); USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR). Scientific Discovery through Advanced Computing (SciDAC); National Science Foundation (NSF)

Grant/Contract Number:: AC52-06NA25396; 89233218CNA000001

OSTI ID:: 2283596

Alternate ID(s):: OSTI ID: 2335754

Report Number(s):: LA-UR-23-31683

Journal Information:: The Astrophysical Journal. Letters, Journal Name: The Astrophysical Journal. Letters Vol. 962 Journal Issue: 1; ISSN 2041-8205

Publisher:: American Astronomical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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