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Free keywords:
General Relativity and Quantum Cosmology, gr-qc, Astrophysics, High Energy Astrophysical Phenomena, astro-ph.HE
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.
