Pre/Post-Merger Consistency Test for Gravitational Signals from Binary Neutron Star Mergers

Pre/Post-Merger Consistency Test for Gravitational Signals from Binary Neutron Star Mergers

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redken 07m Gravitational waves from binary neutron star (BNS) mergers can constrain nuclear models, predicting their equation of state (EOS).Matter effects on the inspiral-merger signal are encoded in the multipolar tidal polarizability parameters, whose leading order combination is sufficient to capture, with high accuracy, the key features of the merger waveform.Similar EOS-insensitive relations exist for the post-merger signal and can be used to model the emissions from the remnant.Several works suggested that the appearance of new degrees of freedom in high-density post-merger matter can be inferred by observing a violation of these EOS-insensitive relations.Here, we demonstrate a Bayesian method to test cloud19 mail such an EOS-insensitive relation between the tidal polarizability parameters (or any other equivalent parameter) and the dominant post-merger frequency using information from the pre-and-post-merger signal.

Technically, the method is similar to the inspiral-merger-ringdown consistency tests of General Relativity with binary black holes.However, differently from the latter, BNS pre/post-merger consistency tests are conceptually less informative and they only address the consistency of the assumed EOS-insensitive relation.Specifically, we discuss how such tests cannot conclusively discriminate between an EOS without respecting such a relation and the appearance of new degrees of freedom (or phase transitions) in high-density matter.