Symmetry energy dependence of the bulk viscosity of nuclear matter
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arXiv
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| Main Authors: | , , , |
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| Format: | Preprint |
| Published: |
2025
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| _version_ | 1866911256536940544 |
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| author | Yang, Yumu Hippert, Mauricio Speranza, Enrico Noronha, Jorge |
| author_facet | Yang, Yumu Hippert, Mauricio Speranza, Enrico Noronha, Jorge |
| contents | We clarify how the weak-interaction-driven bulk viscosity $ζ$ and the bulk relaxation time $τ_Π$ of neutrino-transparent $npe$ matter depend on the nuclear symmetry energy. We show that, at saturation density, the equation-of-state dependence of these transport quantities is fully determined by the experimentally constrained nuclear symmetry energy $S$ and its slope $L$. Variations of $L$ can change the bulk viscosity by orders of magnitude, which can affect both the dissipative and the conservative tidal response of neutron stars. This suggests that both conservative and dissipative effects encoded in the gravitational-wave signatures of binary neutron star inspirals may help constrain nuclear symmetry energy properties. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2504_07805 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Symmetry energy dependence of the bulk viscosity of nuclear matter Yang, Yumu Hippert, Mauricio Speranza, Enrico Noronha, Jorge Nuclear Theory High Energy Astrophysical Phenomena General Relativity and Quantum Cosmology We clarify how the weak-interaction-driven bulk viscosity $ζ$ and the bulk relaxation time $τ_Π$ of neutrino-transparent $npe$ matter depend on the nuclear symmetry energy. We show that, at saturation density, the equation-of-state dependence of these transport quantities is fully determined by the experimentally constrained nuclear symmetry energy $S$ and its slope $L$. Variations of $L$ can change the bulk viscosity by orders of magnitude, which can affect both the dissipative and the conservative tidal response of neutron stars. This suggests that both conservative and dissipative effects encoded in the gravitational-wave signatures of binary neutron star inspirals may help constrain nuclear symmetry energy properties. |
| title | Symmetry energy dependence of the bulk viscosity of nuclear matter |
| topic | Nuclear Theory High Energy Astrophysical Phenomena General Relativity and Quantum Cosmology |
| url | https://arxiv.org/abs/2504.07805 |