Hot and dense matter equation of state probability distributions for astrophysical simulations

Hot and dense matter equation of state probability distributions for astrophysical simulations
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天体物理模拟的热致密物质状态概率分布方程

DOI:
10.1103/physrevc.105.035803
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发表时间:
2022
期刊:
影响因子:
3.1
通讯作者:
Holt, Jeremy W.
Holt, Jeremy W.
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Du, Xingfu;Steiner, Andrew W.;Holt, Jeremy W.

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我们在均匀核子物质的状态方程中加入了一个核系综,以产生一组新的模型,适用于核坍缩超新星和中子星星合并的天体物理模拟。我们实施的经验约束(i)核质量测量,(ii)质子-质子散射相移,(iii)中子星星观测。我们的模型还受到基于现实核力的微观多体理论计算的指导,包括量子蒙特卡罗模拟的零温中子物质状态方程和有限温度多体微扰理论对自由能的热贡献。我们确保我们的模型的参数可以改变,同时保持热力学的一致性和连接到实验或观测数据,从而提供了一个概率分布的天体物理热和致密物质状态方程。我们比较我们的结果与其他可用的状态方程。虽然我们的概率分布确实代表了大量可能的状态方程,但我们还不能说已经完全探索了所有的不确定性,特别是关于热稠密介质中原子核的结构。
We add an ensemble of nuclei to the equation of state for homogeneous nucleonic matter to generate a new set of models suitable for astrophysical simulations of core-collapse supernovae and neutron star mergers. We implement empirical constraints from (i) nuclear mass measurements, (ii) proton-proton scattering phase shifts, and (iii) neutron star observations. Our model is also guided by microscopic many-body theory calculations based on realistic nuclear forces, including the zero-temperature neutron matter equation of state from quantum Monte Carlo simulations and thermal contributions to the free energy from finite-temperature many-body perturbation theory. We ensure that the parameters of our model can be varied while preserving thermodynamic consistency and the connection to experimental or observational data, thus providing a probability distribution of the astrophysical hot and dense matter equation of state. We compare our results with those obtained from other available equations of state. While our probability distributions indeed represent a large number of possible equations of state, we cannot yet claim to have fully explored all of the uncertainties, especially with regard to the structure of nuclei in the hot and dense medium.
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