Phenomenological model of gravitational self-force enhanced tides in inspiralling binary neutron stars
arXiv:2407.08538 · doi:10.1103/PhysRevD.110.104013
Abstract
Gravitational waves from inspiralling binary neutron stars provide unique access to ultra-dense nuclear matter and offer the ability to constrain the currently unknown neutron star equation-of-state through tidal measurements. This, however, requires the availability of accurate and efficient tidal waveform models. In this paper we present PhenomGSF, a new phenomenological tidal phase model for the inspiral of neutron stars in the frequency-domain, which captures the gravitational self-force informed tidal contributions of the time-domain effective-one-body model TEOBResumS. PhenomGSF is highly faithful and computationally efficient, and by choosing a modular approach, it can be used in conjunction with any frequency-domain binary black hole waveform model to generate the complete phase for a binary neutron star inspiral. PhenomGSF is valid for neutron star binaries with unequal masses and mass ratios between 1 and 3, and dimensionless tidal deformabilities up to 5000. Furthermore, PhenomGSF does not assume universal relations or parameterised equations-of-state, hence allowing for exotic matter analyses and beyond standard model physics investigations. We demonstrate the efficacy and accuracy of our model through comparisons against TEOBResumS, numerical relativity waveforms and full Bayesian inference, including a reanalysis of the binary neutron star observation GW170817.
arXiv comment26 pages, 14 figures
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