Probing Extreme-density Matter with Gravitational-wave Observations of Binary Neutron Star Merger Remnants

David Radice, Sebastiano Bernuzzi, Walter Del Pozzo, Luke F. Roberts, Christian D. Ott

Research output: Contribution to journalArticle

37 Scopus citations

Abstract

We present a proof-of-concept study, based on numerical-relativity simulations, of how gravitational waves (GWs) from neutron star merger remnants can probe the nature of matter at extreme densities. Phase transitions and extra degrees of freedom can emerge at densities beyond those reached during the inspiral, and typically result in a softening of the equation of state (EOS). We show that such physical effects change the qualitative dynamics of the remnant evolution, but they are not identifiable as a signature in the GW frequency, with the exception of possible black hole formation effects. The EOS softening is, instead, encoded in the GW luminosity and phase and is in principle detectable up to distances of the order of several megaparsecs with advanced detectors and up to hundreds of megaparsecs with third-generation detectors. Probing extreme-density matter will require going beyond the current paradigm and developing a more holistic strategy for modeling and analyzing postmerger GW signals.

Original languageEnglish (US)
Article numberL10
JournalAstrophysical Journal Letters
Volume842
Issue number2
DOIs
StatePublished - Jun 20 2017

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

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