New Nuclear Equation of State for Core-Collapse Supernovae with the Variational Method
New Nuclear Equation of State for Core-Collapse Supernovae with the Variational Method
复制标题
用变分法建立核心塌陷超新星的新核状态方程
DOI：
10.1051/epjconf/20146607026
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发表时间：
2014
影响因子：
--
通讯作者：
H. Suzuki and K. Sumiyoshi
中科院分区：
文献类型：
--
作者：
H. Togashi;S. Yamamuro;K. Nakazato;M. Takano;H. Suzuki and K. Sumiyoshi
我们报告了我们用变分方法构造一个新的核状态方程(EOS)来模拟核坍缩超新星(SN)的现状。从现实的核哈密顿量出发，用团簇变分方法构造了均匀核物质的状态方程；对于非均匀核物质，用Thomas-Fermi方法计算了状态方程。所得到的均匀物质的热力学性质与费米超网链变分计算的结果符合得很好，所建立的相图也接近于沈-状态方程的相图。用该状态方程计算的零温中子星结构与最近的观测数据一致，中子星的最大质量略大于沈阳状态方程的最大质量。利用目前的均匀核物质状态方程，我们还用绝热流体力学的简化公式对核心塌缩超新星进行了一维模拟。与沈氏状态方程相比，该状态方程的星核更为紧凑，相应地，该模型的爆炸能量也大于沈氏状态方程的爆炸能量。
We report the current status of our project to construct a new nuclear equation of state (EOS) with the variational method for core-collapse supernova (SN) simulations. Starting from the realistic nuclear Hamiltonian, the EOS for uniform nuclear matter is constructed with the cluster variational method: For non-uniform nuclear matter, the EOS is calculated with the Thomas-Fermi method. The obtained thermodynamic quantities of uniform matter are in good agreement with those with more sophisticated Fermi Hypernetted Chain variational calculations, and phase diagrams constructed so far are close to those of the Shen-EOS. The structure of neutron stars calculated with this EOS at zero temperature is consistent with recent observational data, and the maximum mass of the neutron star is slightly larger than that with the Shen-EOS. Using the present EOS of uniform nuclear matter, we also perform the 1D simulation of the core-collapse supernovae by a simplified prescription of adiabatic hydrodynamics. The stellar core with the present EOS is more compact than that with the Shen-EOS, and correspondingly, the explosion energy in this simulation with the present EOS is larger than that with the Shen-EOS.