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Accessing universal relations of binary neutron star waveforms in massive scalar-tensor theory

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arxiv 2410.00137 v1 pith:PXAXTKXU submitted 2024-09-30 astro-ph.HE gr-qcnucl-th

Alan Tsz-Lok Lam , Yong Gao , Hao-Jui Kuan , Masaru Shibata , Karim Van Aelst , Kenta Kiuchi This is my paper · ORCID
classification astro-ph.HEgr-qcnucl-th
keywords neutronrelationsbinarygravitymassivequasi-universalrelativityscalar-tensor
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We investigate how the quasi-universal relations connecting tidal deformability with gravitational waveform characteristics and/or properties of individual neutron stars that were proposed in the literature within general relativity would be influenced in the massive Damour-Esposito-Farese-type scalar-tensor gravity. For this purpose, we systematically perform numerical relativity simulations of ~120 binary neutron star mergers with varying scalar coupling constants. Although only three neutron-star equations of state are adopted, a clear breach of universality can be observed in the data sets. In addition to presenting difficulties in constructing quasi-universal relations in alternative gravity theories, we also briefly compare the impacts of non-general-relativity physics on the waveform features and those due to the first order or cross-over quantum chromodynamical phase transition.

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Cited by 3 Pith papers

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  1. Subsolar-mass binary mergers of strange stars and neutron stars: gravitational waves and ejecta

    astro-ph.HE 2026-07 conditional novelty 7.0 of 10

    Subsolar strange star mergers produce a lower post-merger-to-cutoff GW frequency ratio than neutron star mergers, cleanly separating the two classes across equations of state and mass ratios.

  2. Axisymmetric stability of neutron stars as extreme rotators in massive scalar-tensor theory

    gr-qc 2025-02 conditional novelty 6.0 of 10

    Differentially rotating scalarized neutron stars with enormous angular momentum are axisymmetrically stable up to the turning point of their mass sequence, beyond which they collapse to black holes, confirming the tur...

  3. SACRA-2D: New axisymmetric general relativistic hydrodynamics code with fixed mesh refinement

    astro-ph.HE 2025-02 conditional novelty 6.0 of 10

    SACRA-2D is a new axisymmetric relativistic hydrodynamics code with the HLLC solver and adaptive mesh refinement, validated by benchmarks showing improved accuracy over the TVDLF solver.

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