Ab initio constraints on thermal effects of the nuclear equation of state
Ab initio constraints on thermal effects of the nuclear equation of state
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DOI：
10.1103/physrevc.100.025805
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发表时间：
2019-04
影响因子：
3.1
通讯作者：
A. Carbone;A. Schwenk
中科院分区：
文献类型：
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作者：
A. Carbone;A. Schwenk
利用多体自洽绿色函数方法分析了无限核物质的有限温度性质，并探讨了天体物理状态方程中用于模拟热效应的热指数的行为。我们展示了热指数是如何密度和温度依赖，不像通常认为的，我们提供了一个误差估计的基础上，我们的从头计算。包含的三体部队被发现是关键的密度依赖性的热指数。我们还比较了我们的结果参数化的核子有效质量的密度依赖性。我们的研究结果指出，预测的引力波信号从中子星合并模拟与恒定的热指数可能存在的缺点。
We exploit the many-body self-consistent Green's function method to analyze finite-temperature properties of infinite nuclear matter and to explore the behavior of the thermal index used to simulate thermal effects in equations of state for astrophysical applications. We show how the thermal index is both density and temperature dependent, unlike often considered, and we provide an error estimate based on our ab initio calculations. The inclusion of three-body forces is found to be critical for the density dependence of the thermal index. We also compare our results to a parametrization in terms of the density dependence of the nucleon effective mass. Our findings point to possible shortcomings of predictions made for the gravitational-wave signal from neutron-star merger simulations with a constant thermal index.