Simulations of Core-collapse Supernovae in Spatial Axisymmetry with Full Boltzmann Neutrino Transport
Simulations of Core-collapse Supernovae in Spatial Axisymmetry with Full Boltzmann Neutrino Transport
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DOI：
10.3847/1538-4357/aaac29
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发表时间：
2017-02
期刊：
影响因子：
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通讯作者：
H. Nagakura;W. Iwakami;S. Furusawa;Hirotada Okawa;A. Harada;K. Sumiyoshi;S. Yamada;H. Matsufuru;A. Imakura
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文献类型：
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作者：
H. Nagakura;W. Iwakami;S. Furusawa;Hirotada Okawa;A. Harada;K. Sumiyoshi;S. Yamada;H. Matsufuru;A. Imakura
我们提出的第一个结果，我们的空间轴对称的核心崩溃超新星模拟与完整的玻尔兹曼中微子输运，这相当于一个时间依赖的五维（两个在空间和三个在动量空间）的问题。特殊的相对论效应被充分考虑与两个能量网格技术。我们进行了两个模拟的祖11.2兆后，采用不同的核状态方程（EOS）：Lattimer和Swesty的状态方程与K = 220 MeV的不可压缩性（LS EOS）和Furusawa的状态方程的基础上的相对论平均场理论与TM1参数集（FS EOS）。在LS EOS中，冲击波在反弹后300 ms达到10700 km，并且仍在扩展，而在FS EOS中，它在10200 km处停止，并在同一时间开始后退。这似乎是由于在整个postbounce阶段，在前者更有力的湍流运动，这导致更高的中微子加热效率的中微子驱动的对流。我们还研究了中微子在动量空间中的分布，这是玻尔兹曼输运相对于其他近似方法的优势。我们发现非轴对称的角分布相对于当地的径向方向，这也产生了非对角分量的爱丁顿张量。我们发现rθ分量达到了优势r θ分量的10%，更重要的是，它决定了横向中微子通量的演化，在透射区，主导了θθ分量。这些数据将有助于进一步测试和改进近似方法中使用的处方。
We present the first results of our spatially axisymmetric core-collapse supernova simulations with full Boltzmann neutrino transport, which amount to a time-dependent five-dimensional (two in space and three in momentum space) problem. Special relativistic effects are fully taken into account with a two-energy-grid technique. We performed two simulations for a progenitor of 11.2 M☉, employing different nuclear equations of state (EOSs): Lattimer and Swesty’s EOS with the incompressibility of K = 220 MeV (LS EOS) and Furusawa’s EOS based on the relativistic mean field theory with the TM1 parameter set (FS EOS). In the LS EOS, the shock wave reaches ∼700 km at 300 ms after bounce and is still expanding, whereas in the FS EOS it stalled at ∼200 km and has started to recede by the same time. This seems to be due to more vigorous turbulent motions in the former during the entire postbounce phase, which leads to higher neutrino-heating efficiency in the neutrino-driven convection. We also look into the neutrino distributions in momentum space, which is the advantage of the Boltzmann transport over other approximate methods. We find nonaxisymmetric angular distributions with respect to the local radial direction, which also generate off-diagonal components of the Eddington tensor. We find that the rθ component reaches ∼10% of the dominant rr component and, more importantly, it dictates the evolution of lateral neutrino fluxes, dominating over the θθ component, in the semitransparent region. These data will be useful to further test and possibly improve the prescriptions used in the approximate methods.