ournal of C osmology and A stroparticle hysics Searching for fast neutrino flavor conversion modes in core-collapse supernova simulations
ournal of C osmology and A stroparticle hysics Searching for fast neutrino flavor conversion modes in core-collapse supernova simulations
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宇宙学和宇宙粒子物理学杂志在核心塌缩超新星模拟中寻找快速中微子味道转换模式
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通讯作者：
S. Yamada
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作者：
H. Nagakura;K. Sumiyoshi;S. Yamada
． 在密集的中微子介质中传播的中微子，比如在核心坍缩超新星中传播的中微子，可以在比真空中预期的短得多的尺度上经历快速的风味转换。我们认为，快速模态发生的必要条件是ν e和ν e的角分布相互交叉。然而，大多数最先进的超新星模拟并没有提供如此详细的角度信息，而是只考虑中微子角分布的几个时刻。我们在此提出了一种有效的方法，利用这些可用的瞬间来搜索超新星模拟中的快速模式。我们的方法基于在角分布中搜索交叉点，可以处理模拟提供的任何数量的矩，尽管当有更高的矩可用时可以捕获更多的交叉点。
. Neutrinos propagating in dense neutrino media such as those in core-collapse supernovae can experience fast flavor conversions on scales much shorter than those expected in vacuum. It is believed that a necessary condition for the occurrence of fast modes is that the angular distributions of ν e and ¯ ν e cross each other. However, most of the state-of-the-art supernova simulations do not provide such detailed angular information and instead, consider only a few moments of neutrino angular distributions. We here propose an efficient method to use these available few moments to search for fast modes in supernova simulations. Our method, which is based on searching for crossings in the angular distributions, can work with any number of moments provided by the simulation though a larger number of crossings can be captured when higher moments are available.