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Binary neutron star mergers in massive scalar-tensor theory: Properties of post-merger remnants

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arxiv 2406.05211 v1 pith:PXDZYNK5 submitted 2024-06-07 gr-qc astro-ph.HE

classification gr-qcastro-ph.HE
keywords neutronfieldmassivepost-mergerscalarbinaryhypermassiveinvestigate
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abstract

We investigate the properties of post-merger remnants of binary neutron star mergers in the framework of Damour-Esposito-Farese-type scalar-tensor theory of gravity with a massive scalar field by numerical relativity simulation. It is found that the threshold mass for prompt collapse is raised in the presence of the excited scalar field. Our simulation results also suggest the existence of long-lived $\phi-$mode in hypermassive neutron stars due to the presence of the massive scalar field which enhances the quasi-radial oscillation in the remnant. We investigate the descalarization condition in hypermassive neutron stars and discover a distinctive signature in post-merger gravitational waves.

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Cited by 2 Pith papers

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

  1. 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...

  2. 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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