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Neutrino trapping and out-of-equilibrium effects in binary neutron star merger remnants

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arxiv 2311.00031 v1 pith:SJ67LPUU submitted 2023-10-31 astro-ph.HE

Neutrino trapping and out-of-equilibrium effects in binary neutron star merger remnants

Pedro Luis Espino , Peter Hammond , David Radice , Sebastiano Bernuzzi , Rossella Gamba , Francesco Zappa , Luis Felipe Longo Micchi , Albino Perego This is my paper
classification astro-ph.HE
keywords effectsequilibriummergerneutronneutrinosstarstarsactive
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abstract

We study out-of-thermodynamic equilibrium effects in neutron star mergers with 3D general-relativistic neutrino-radiation large-eddy simulations. During merger, the cores of the neutron stars remain cold ($T \sim$ a few MeV) and out of thermodynamic equilibrium with trapped neutrinos originating from the hot collisional interface between the stars. However, within ${\sim}2{-}3$ milliseconds matter and neutrinos reach equilibrium everywhere in the remnant. Our results show that dissipative effects, such as bulk viscosity, if present, are only active for a short window of time after the merger.

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Cited by 5 Pith papers

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