Equation of State for warm Neutron Star outer crusts
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arXiv
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| Format: | Preprint |
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2026
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| _version_ | 1866910152212348928 |
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| author | Barba-González, David Albertus, Conrado Pérez-García, M. Ángeles |
| author_facet | Barba-González, David Albertus, Conrado Pérez-García, M. Ángeles |
| contents | We describe the equation of state (EoS) of a warm ion plasma as obtained by performing microscopic many-body simulations using Molecular Dynamics computational techniques. Using the cold one-component plasma (OCP) composition in the Neutron Star (NS) outer crust assumed in Murarka et al. (2022) with a representative heavy nucleus for each density, we refine previous calculations. We include electron screening and modeling of ions as finite-size Gaussian distributions in the interaction potential, together with an efficient Ewald energy summation procedure. From this, the EoS relation $P(n_B,T)$ is obtained as a function of baryonic density and temperature in the NS outer crust under conditions $n_B\in[7.48\times 10^{-10},2.09\times10^{-4}]$ $ \rm fm^{-3}$ , $k_{B}T\in[1,5]$ MeV. In order to improve the usability of our results we provide tabulated data values along with a neural network parametrization available in the Zenodo repository, see https://zenodo.org/records/15348712. We find that even at moderate temperatures, thermal effects of ions are key in the higher density region closer to the inner crust, when described using a thermal effective parametrization based on the thermal adiabatic index $Γ_{th}$. We compare our results with other EoS in the literature performing a critical discussion. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_18136 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Equation of State for warm Neutron Star outer crusts Barba-González, David Albertus, Conrado Pérez-García, M. Ángeles High Energy Astrophysical Phenomena Solar and Stellar Astrophysics Nuclear Theory Plasma Physics We describe the equation of state (EoS) of a warm ion plasma as obtained by performing microscopic many-body simulations using Molecular Dynamics computational techniques. Using the cold one-component plasma (OCP) composition in the Neutron Star (NS) outer crust assumed in Murarka et al. (2022) with a representative heavy nucleus for each density, we refine previous calculations. We include electron screening and modeling of ions as finite-size Gaussian distributions in the interaction potential, together with an efficient Ewald energy summation procedure. From this, the EoS relation $P(n_B,T)$ is obtained as a function of baryonic density and temperature in the NS outer crust under conditions $n_B\in[7.48\times 10^{-10},2.09\times10^{-4}]$ $ \rm fm^{-3}$ , $k_{B}T\in[1,5]$ MeV. In order to improve the usability of our results we provide tabulated data values along with a neural network parametrization available in the Zenodo repository, see https://zenodo.org/records/15348712. We find that even at moderate temperatures, thermal effects of ions are key in the higher density region closer to the inner crust, when described using a thermal effective parametrization based on the thermal adiabatic index $Γ_{th}$. We compare our results with other EoS in the literature performing a critical discussion. |
| title | Equation of State for warm Neutron Star outer crusts |
| topic | High Energy Astrophysical Phenomena Solar and Stellar Astrophysics Nuclear Theory Plasma Physics |
| url | https://arxiv.org/abs/2604.18136 |