Equation of state of hot neutron star matter using finite range simple effective interaction

IF 3.4 3区物理与天体物理 Q2 PHYSICS, NUCLEAR Journal of Physics G: Nuclear and Particle Physics Pub Date : 2024-06-30 DOI:10.1088/1361-6471/ad57d7

T R Routray, S Sahoo, X Viñas, D N Basu and M Centelles

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Abstract

The equation of state (EoS) of hot neutron star matter (NSM) of n+p+e+μ composition in β-equilibrium is studied for both neutrino-free isothermal and neutrino-trapped isoentropic conditions, using the formalism where the thermal evolution is built upon its zero-temperature predictions in a self-consistent manner. The accuracy of the parabolic approximation, often used in the finite temperature calculation of hot NSM, is verified by comparing with the results obtained from the exact evaluation in the neutrino-free NSM. The EoS of neutrino-trapped isoentropic matter at low entropic condition, relevant to the core-collapsing supernovae, is formulated. In the isoentropic matter, the particle fractions and EoS have marginal variance as entropy per particle vary between 1 and 3 (in the unit of kB), but the temperature profile shows marked variation. The isentropes are found to be much less sensitive to the nuclear matter incompressibility, but have large dependence on the slope parameter L. The bulk properties of the neutron stars predicted by the isoentropic EoSs for different entropy are calculated. A model calculation for the early stage evolution of protoneutron star to neutron star configuration is also given.

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利用有限范围简单有效相互作用计算热中子星物质的状态方程

利用热演化以自洽方式建立在零温预测基础上的形式主义，研究了 n+p+e+μ 组成的热中子星物质（NSM）在 β 平衡条件下的状态方程（EoS），包括无中微子等温和中微子俘获等熵条件。抛物线近似常用于热NSM的有限温度计算，通过与无中微子NSM精确评估的结果进行比较，验证了抛物线近似的准确性。在低熵条件下，制定了中微子捕获的等熵物质的 EoS，这与内核坍缩超新星有关。在等熵物质中，由于每个粒子的熵在 1 到 3 之间变化（单位 kB），粒子分数和 EoS 具有边际差异，但温度曲线显示出明显的变化。我们发现等熵对核物质不可压缩性的敏感度要低得多，但对斜率参数 L 的依赖性很大。还给出了原中子星向中子星构型演化早期阶段的模型计算。

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来源期刊

Journal of Physics G: Nuclear and Particle Physics 物理-物理：核物理

CiteScore

7.60

自引率

5.70%

发文量

105

审稿时长

1 months

期刊介绍： Journal of Physics G: Nuclear and Particle Physics (JPhysG) publishes articles on theoretical and experimental topics in all areas of nuclear and particle physics, including nuclear and particle astrophysics. The journal welcomes submissions from any interface area between these fields. All aspects of fundamental nuclear physics research, including: nuclear forces and few-body systems; nuclear structure and nuclear reactions; rare decays and fundamental symmetries; hadronic physics, lattice QCD; heavy-ion physics; hot and dense matter, QCD phase diagram. All aspects of elementary particle physics research, including: high-energy particle physics; neutrino physics; phenomenology and theory; beyond standard model physics; electroweak interactions; fundamental symmetries. All aspects of nuclear and particle astrophysics including: nuclear physics of stars and stellar explosions; nucleosynthesis; nuclear equation of state; astrophysical neutrino physics; cosmic rays; dark matter. JPhysG publishes a variety of article types for the community. As well as high-quality research papers, this includes our prestigious topical review series, focus issues, and the rapid publication of letters.