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Impact and detectability of spin-tidal couplings in neutron star inspirals

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arxiv 2204.12510 v1 pith:QQBUIYL6 submitted 2022-04-26 gr-qc astro-ph.HE

classification gr-qcastro-ph.HE
keywords tidalneutroncouplingsdetectorsgravitationallovemodelsnumbers
verification ladder T0 review T1 audit T2 compute T3 formal

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abstract

The gravitational wave signal from a binary neutron star merger carries the imprint of the deformability properties of the coalescing bodies, and then of the equation of state of neutron stars. In current models of the waveforms emitted in these events, the contribution of tidal deformation is encoded in a set of parameters, the tidal Love numbers. More refined models include tidal-rotation couplings, described by an additional set of parameters, the rotational tidal Love numbers, which appear in the waveform at $6.5$ post-Newtonian order. For neutron stars with spins as large as $\sim0.1$, we show that neglecting tidal-rotation couplings may lead to a significant error in the parameter estimation by third-generation gravitational wave detectors. By performing a Fisher matrix analysis we assess the measurability of rotational tidal Love numbers, showing that their contribution in the waveform could be measured by third-generation detectors. Our results suggest that current models of tidal deformation in late inspiral should be improved in order to avoid waveform systematics and extract reliable information from gravitational wave signals observed by next generation detectors.

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Cited by 3 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Theoretical modeling of approximate universality of tidally deformed neutron stars

    gr-qc 2025-05 conditional novelty 7.0 of 10

    The paper analytically derives the universal Love relations for neutron stars and explains their equation-of-state insensitivity through a cancellation mechanism tied to low compressibility.

  2. Testing the nature of compact objects in the lower mass gap using gravitational wave observations

    astro-ph.HE 2025-09 conditional novelty 6.0 of 10

    Simulated low-mass-gap boson star binaries are severely mis-measured when analyzed with black hole waveform models, but a model including both spin-induced quadrupole and tidal effects recovers the correct masses.

  3. The error budget of binary neutron star merger simulations for configurations with high spin

    gr-qc 2025-06 accept novelty 6.0 of 10

    For highly spinning (chi=0.5) binary neutron stars, evolution code choice is the largest numerical waveform error, and current analytical models disagree with numerical relativity beyond that error after the stars touch.

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