Relativistic mean-field model with density- and isospin-density-dependent couplings
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arXiv
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| Autori principali: | , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| _version_ | 1866914164512915456 |
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| author | Frohaug, Gabriel Maslov, Konstantin Dexheimer, Veronica Grefa, Joaquin Jahan, Johannes Ratti, Claudia Restrepo, Tulio E. |
| author_facet | Frohaug, Gabriel Maslov, Konstantin Dexheimer, Veronica Grefa, Joaquin Jahan, Johannes Ratti, Claudia Restrepo, Tulio E. |
| contents | We present a new hadronic EoS with hyperons built within the relativistic mean-field (RMF) formalism with baryon-density- and isospin-density-dependent couplings. Motivated by microscopic calculations showing density- and isospin-asymmetry-dependence of self-energies, we implement a new form for the baryon-meson couplings. The parameters for the couplings are constrained by a Bayesian analysis, which anchors the model to nuclear saturation properties, chiral effective field theory ($χ$EFT) predictions for pure neutron matter, heavy-ion collision data, and HALQCD-based hyperon potential calculations at 3-momentum $|\mathbf{k}|=0$ in both isospin-symmetric and pure neutron matter. The resulting EoS satisfies neutron star mass-radius constraints from NICER and GW170817, providing another way to address the hyperon puzzle. The low-density part of the EoS is described via nuclear statistical equilibrium with modern mass tables (AME20/FRDM12, 8244 nuclei), providing a novel and complete general-purpose EoS for astrophysical simulations. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2511_15646 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Relativistic mean-field model with density- and isospin-density-dependent couplings Frohaug, Gabriel Maslov, Konstantin Dexheimer, Veronica Grefa, Joaquin Jahan, Johannes Ratti, Claudia Restrepo, Tulio E. Nuclear Theory High Energy Astrophysical Phenomena High Energy Physics - Phenomenology We present a new hadronic EoS with hyperons built within the relativistic mean-field (RMF) formalism with baryon-density- and isospin-density-dependent couplings. Motivated by microscopic calculations showing density- and isospin-asymmetry-dependence of self-energies, we implement a new form for the baryon-meson couplings. The parameters for the couplings are constrained by a Bayesian analysis, which anchors the model to nuclear saturation properties, chiral effective field theory ($χ$EFT) predictions for pure neutron matter, heavy-ion collision data, and HALQCD-based hyperon potential calculations at 3-momentum $|\mathbf{k}|=0$ in both isospin-symmetric and pure neutron matter. The resulting EoS satisfies neutron star mass-radius constraints from NICER and GW170817, providing another way to address the hyperon puzzle. The low-density part of the EoS is described via nuclear statistical equilibrium with modern mass tables (AME20/FRDM12, 8244 nuclei), providing a novel and complete general-purpose EoS for astrophysical simulations. |
| title | Relativistic mean-field model with density- and isospin-density-dependent couplings |
| topic | Nuclear Theory High Energy Astrophysical Phenomena High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2511.15646 |