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arXiv · 2507.15426

Leveraging NRTidalv3 to develop gravitational waveform models with higher-order modes for binary neutron star systems

Adrian Abac·Felip A. Ramis Vidal·Marta Colleoni·Anna Puecher·Alejandra Gonzalez·Tim Dietrich
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Abstract

Accurate and reliable gravitational waveform models are crucial in determining the properties of compact binary mergers. In particular, next-generation gravitational-wave detectors will require more accurate waveforms to avoid biases in the analysis. In this work, we extend the recent NRTidalv3 model to account for higher-mode corrections in the tidal phase contributions for binary neutron star systems. The higher-mode, multipolar NRTidalv3 model is then attached to several binary-black-hole baselines, such as the phenomenological IMRPhenomXHM and IMRPhenomXPHM models, and the effective-one-body-based model SEOBNRv5HM_ROM. We test the performance and validity of the newly developed models by comparing them with numerical-relativity simulations and other tidal models. Finally, we employ them in parameter estimation analyses on simulated signals from both comparable-mass and high-mass-ratio systems, as well as on the gravitational-wave event GW170817, for which we find consistent results with respect to previous analyses.

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Adrian Abac, Felip A. Ramis Vidal, Marta Colleoni, Anna Puecher, Alejandra Gonzalez, Tim Dietrich. 2025-07-21. Leveraging NRTidalv3 to develop gravitational waveform models with higher-order modes for binary neutron star systems. https://arxiv.org/abs/2507.15426

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