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arXiv 2406.00484nucl-thastro-ph.HEastro-ph.SR
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含超子致密星有限温度状态方程:三维表格

Finite-temperature equations of state of compact stars with hyperons: three-dimensional tables

Stefanos Tsiopelas, Armen Sedrakian, Micaela Oertel

AI总结:

本文构建了覆盖超新星、原中子星及双中子星并合模拟所需密度、温度和电子分数范围的超子核物质有限温度状态方程三维表格,基于协变密度泛函理论并符合天体物理与核约束,以CompOSE格式提供。

摘要:

我们构建了超子核物质在密度、温度和电子丰度范围内的有限温度状态方程(EoS)表格,这些范围是超新星、原中子星和双中子星并合数值模拟所需的,并以{\sc CompOSE}数据库的格式呈现。这些表格提取自一个基于协变密度泛函(CDF)理论的模型,该模型以与当前天体物理和核约束一致的方式包含了完整的$J^P=1/2^+$重子八重态。我们采用了对称能量斜率$L_{\rm sym}=30$、50和70 MeV的三个不同值以及固定偏斜度$Q_{\rm sat}=400$ MeV的参数化来描述饱和密度以上的物质。一个用于非均匀物质状态方程的模型在亚饱和密度处与高密度超子核状态方程相匹配。我们讨论了所得状态方程的一般特征以及物质组成随密度、温度和电子分数的变化。这些模型的核特性和奇异分数与文献中的替代模型进行了比较。在零温度极限下,静态和快速旋转致密星的积分性质被讨论,并与多信使天体物理约束进行了对比。

英文摘要:

We construct tables of finite temperature equation of state (EoS) of hypernuclear matter in the range of densities, temperatures, and electron fractions that are needed for numerical simulations of supernovas, proto-neutron stars, and binary neutron star mergers and cast them in the format of {\sc CompOSE} database. The tables are extracted from a model that is based on covariant density functional (CDF) theory that includes the full $J^P=1/2^+$ baryon octet in a manner that is consistent with the current astrophysical and nuclear constraints. We employ a parameterization with three different values of the slope of the symmetry energy $L_{\rm sym}=30$, 50 and 70 MeV and fixed skewness $Q_{\rm sat}= 400$ MeV for above saturation matter. A model for the EoS of inhomogeneous matter is matched at sub-saturation density to the high-density hypernuclear EoS. We discuss the generic features of the resulting EoS and the composition of matter as a function of density, temperature, and electron fraction. The nuclear characteristics and strangeness fraction of these models are compared to the alternatives from the literature. The integral properties of static and rapidly rotating compact stars in the limit of zero temperature are discussed and confronted with the multimessenger astrophysical constraints.

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