Tidal dissipation in binary neutron star inspiral: bias study and modeling of frequency domain phase

Abstract

During the inspiral of a binary neutron star, viscous processes in the neutron star matter can damp out the tidal energy induced by its companion and convert it to thermal energy. This tidal dissipation/heating process introduces a net phase shift in the gravitational wave signal. In our recent work (Ghosh et al., Phys. Rev. D 109, 103036 (2024)), we showed that tidal dissipation from bulk viscosity originating from the non-leptonic weak interactions involving hyperons could have a detectable phase shift in the gravitational-wave (GW) signal in the next-generation GW detectors. In this work, we model the dephasing due to tidal dissipation in a post-Newtonian (PN) expansion and incorporate this in gravitational waveforms for equal mass binary neutron stars. We then estimate the systematic bias incurred in tidal deformability measurements in simulated signal injection studies when this physical effect is not accounted for in waveform models. Lastly, we perform a full Bayesian parameter estimation with our model to show how accurately we can measure the additional phase due to tidal dissipation in future GW observations and discuss its significance in extreme matter studies.

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ORCID for Suprovo Ghosh: orcid.org/0000-0002-1656-9870

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