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Bulk viscosity transport coefficients in neutron star mergers

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arxiv 2312.09364 v1 pith:UWL3TQA4 submitted 2023-12-14 nucl-th astro-ph.HEhep-ph

Yumu Yang , Mauricio Hippert , Enrico Speranza , Jorge Noronha This is my paper · ORCID
classification nucl-thastro-ph.HEhep-ph
keywords coefficientstransportstateweak-interactionbulkbulk-viscouscalculatechanges
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abstract

We compute first and second-order bulk-viscous transport properties due to weak-interaction processes in $npe$ matter in the neutrino transparent regime. The transport coefficients characterize the out-of-beta-equilibrium pressure corrections, which depend on the weak-interaction rates and the equation of state. We calculate these coefficients for realistic equations of state and show they are sensitive to changes in the nuclear symmetry energy $J$ and its slope $L$.

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Cited by 1 Pith paper

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  1. Extending Israel-Stewart theory: Causal bulk viscosity at large gradients

    gr-qc 2025-01 accept novelty 8.0 of 10

    A new family of polytropic bulk-viscous fluids reduces to Israel-Stewart near equilibrium and stays causal, symmetric hyperbolic, and thermodynamically consistent for arbitrarily large viscous stresses.

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