Application of the nuclear equation of state obtained by the variational method to core-collapse supernovae
Application of the nuclear equation of state obtained by the variational method to core-collapse supernovae
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DOI：
10.1093/ptep/ptu020
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发表时间：
2014-01
影响因子：
3.5
通讯作者：
H. Togashi;M. Takano;K. Sumiyoshi;K. Nakazato
中科院分区：
文献类型：
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作者：
H. Togashi;M. Takano;K. Sumiyoshi;K. Nakazato
从阿贡v18和厄巴纳IX核力出发，用变分法构造了热非对称核物质状态方程，并将其应用于球对称核坍缩超新星（SNe）。我们首先研究了等熵β稳定SN物质的物态方程，发现变分物态方程的物质比Shen物态方程的物质更富中子。利用均匀物质的变分状态方程，辅以低密度非均匀物质的沈状态方程，我们从15太阳质量的超新星前模型出发，对有和没有中微子转移的核塌缩SNe进行了广义相对论球对称模拟。在不考虑中微子转移的绝热模拟中，爆炸是成功的，并且变分状态方程的爆炸能量大于Shen状态方程的爆炸能量。在中微子转移的模拟中，冲击波停止，然后爆炸失败，就像在其他球对称模拟中一样。由于变分状态方程的相对柔软性，变分状态方程的内核比Shen状态方程的内核更紧凑。这表明变分状态方程比Shen状态方程更有利于SN爆炸。
The equation of state (EOS) for hot asymmetric nuclear matter which is constructed with the variational method starting from the Argonne v18 and Urbana IX nuclear forces is applied to spherically symmetric core-collapse supernovae (SNe). We first investigate the EOS of isentropic beta-stable SN matter, and find that the matter with the variational EOS is more neutron-rich than that with the Shen EOS. Using the variational EOS for uniform matter supplemented by the Shen EOS of non-uniform matter at low densities, we perform general-relativistic spherically symmetric simulations of core-collapse SNe with and without neutrino transfer, starting from a presupernova model of 15 solar mass. In the adiabatic simulation without neutrino transfer, the explosion is successful, and the explosion energy with the variational EOS is larger than that with the Shen EOS. In the case of the simulation with neutrino transfer, the shock wave stalls and then the explosion fails, as in other spherically symmetric simulations. The inner core with the variational EOS is more compact than that with the Shen EOS, due to the relative softness of the variational EOS. This implies that the variational EOS is more advantageous for SN explosions than the Shen EOS.