Linear analysis of fast-pairwise collective neutrino oscillations in core-collapse supernovae based on the results of Boltzmann simulations
Linear analysis of fast-pairwise collective neutrino oscillations in core-collapse supernovae based on the results of Boltzmann simulations
复制标题
基于玻尔兹曼模拟结果的核心塌陷超新星快速成对集体中微子振荡的线性分析
DOI：
10.1103/physrevd.99.103011
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发表时间：
2019
影响因子：
5
通讯作者：
Sumiyoshi Kohsuke
中科院分区：
文献类型：
--
作者：
Delfan Azari Milad;Yamada Shoichi;Morinaga Taiki;Iwakami Wakana;Okawa Hirotada;Nagakura Hiroki;Sumiyoshi Kohsuke
中微子在大质量恒星的引力坍缩产生超新星爆炸并形成致密恒星（如中子星和黑洞）后，在其核心深处密集分布。有人认为，他们可能会改变他们的味道身份，通过所谓的快速成对转换相互前向散射诱导。如果这是真的，超新星爆炸的动力学将受到影响，因为转换可能发生在中微子球附近，中微子从那里有效地发射出来。在本文中，我们进行了一个试点研究的基础上的结果完全自洽的，现实的模拟核心坍缩超新星爆炸在两个空间维度下轴对称的可能性。由于我们在模拟中不是作为后处理而是在真实的时间中求解中微子转移的玻尔兹曼方程，因此可以随时获得核心中所有点的中微子在动量空间中的角分布，这是我们模拟的一个明显特征。我们采用一些这些分布提取在几个选定的点和时间从数值数据和应用线性分析，以评估转换的可能性。我们专注于中微子球附近，不同种类的中微子在不同的方向上移动，并因此具有不同的角分布。这是一项试点研究，不久将进行更彻底的调查。不幸的是，至少对于我们在这个特定模型中研究的空间点和时间，我们没有发现转换的积极迹象。因此，我们调查，而详细的条件，通过修改的中微子分布，而任意的手转换。
Neutrinos are densely populated deep inside the core of massive stars after their gravitational collapse to produce supernova explosions and form compact stars such as neutron stars and black holes. It has been considered that they may change their flavor identities through so-called fast-pairwise conversions induced by mutual forward scatterings. If that is really the case, the dynamics of supernova explosion will be influenced, since the conversion may occur near the neutrino sphere, from which neutrinos are effectively emitted. In this paper, we conduct a pilot study of such possibilities based on the results of fully self-consistent, realistic simulations of a core-collapse supernova explosion in two spatial dimensions under axisymmetry. As we solved the Boltzmann equations for neutrino transfer in the simulation not as a postprocess but in real time, the angular distributions of neutrinos in momentum space for all points in the core at all times are available, a distinct feature of our simulations. We employ some of these distributions extracted at a few selected points and times from the numerical data and apply linear analysis to assess the possibility of the conversion. We focus on the vicinity of the neutrino sphere, where different species of neutrinos move in different directions and have different angular distributions as a result. This is a pilot study for a more thorough survey that will follow soon. We find no positive sign of conversion unfortunately at least for the spatial points and times we studied in this particular model. We hence investigate rather in detail the condition for the conversion by modifying the neutrino distributions rather arbitrarily by hand.