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arXiv 2404.05910nucl-thastro-ph.HE
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使用有限力程简单有效相互作用的热中子星物质状态方程

Equation of State of Hot Neutron Star Matter using Finite Range Simple Effective Interaction

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

AI总结:

本文利用有限力程简单有效相互作用研究了热中子星物质在无中微子等温与有中微子俘获等熵条件下的状态方程,验证了抛物线近似的准确性,并分析了等熵线对斜率参数L的强依赖性及其对原中子星早期演化的影响。

摘要:

本文研究了由n+p+e+μ组成且处于β平衡的热中子星物质的状态方程,分别针对无中微子的等温条件和有中微子俘获的等熵条件,采用热演化以自洽方式建立在其零温度预言之上的形式体系。通过将无中微子中子星物质中精确计算的结果与常用近似结果进行对比,验证了热中子星物质有限温度计算中经常使用的抛物线近似的准确性。本文建立了与核心坍缩超新星相关的低熵条件下有中微子俘获的等熵物质状态方程。在等熵物质中,当每个粒子的熵在1到3(以k_B为单位)之间变化时,粒子分数和状态方程仅有微小变化,但温度分布却表现出显著变化。研究发现等熵线对核物质不可压缩性的敏感度要低得多,但对斜率参数L有很大的依赖性。本文计算了不同熵下由等熵状态方程预言的中子星整体性质。此外,还给出了原中子星向中子星构型早期演化阶段的一个模型计算。

英文摘要:

The equation of state of hot neutron star matter of n+p+e+$μ$ composition in $β$-equilibrium is studied for both neutrino-free isothermal and neutrino-trapped isentropic 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 neutron star matter, is verified by comparing with the results obtained from the exact evaluation in the neutrino-free neutron star matter. The equation of state of neutrino-trapped isentropic matter at low entropic condition, relevant to the core-collapsing supernovae, is formulated. In the isentropic matter, the particle fractions and equation of state have marginal variance as entropy per particle varies between 1 to 3 (in the unit of k$_B$), but the temperature profile shows marked variation. The isentropes are found to be much less sensitive to the nuclear matter incompressibility, but have a large dependence on the slope parameter L. The bulk properties of the neutron stars predicted by the isentropic equation of state for different entropy are calculated. A model calculation for the early stage evolution of the protoneutron star to neutron star configuration is also given.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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