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

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

Alan Tsz-Lok Lam , Hao-Jui Kuan , Masaru Shibata , Karim Van Aelst , Kenta Kiuchi This is my paper

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classification gr-qc astro-ph.HE
keywords neutronfieldmassivepost-mergerscalarbinaryhypermassiveinvestigate
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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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  1. Inferring Neutron-Star Properties from Post-merger Gravitational-wave Spectra with Neural Networks

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    Neural networks trained on noise-free post-merger spectra outperform linear regression baselines at predicting neutron-star mass, quadrupolar tidal deformability, and mass-radius slope from numerical-relativity catalogs.