Nonlinear evolution of fast neutrino flavor conversion in the preshock region of core-collapse supernovae
Nonlinear evolution of fast neutrino flavor conversion in the preshock region of core-collapse supernovae
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DOI：
10.1103/physrevd.104.083035
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发表时间：
2021-04
影响因子：
5
通讯作者：
Masamichi Zaizen;Taiki Morinaga
中科院分区：
文献类型：
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作者：
Masamichi Zaizen;Taiki Morinaga
在具有高密度中微子气体的环境中，例如在核心塌缩超新星中，中微子可能会由于自身相互作用而经历集体中微子振荡。特别是，由中微子角分布的交叉驱动的快速风味转换可以影响爆炸机制、核合成和中微子观测。我们对中微子角分布进行了非线性风味演化的数值计算，预计在震前区域会产生微小的交叉。我们证明了快速不稳定性被触发，并且考虑到SN动力学中的μ子产生和弱磁性，在现实的三味模型下级联发展。微小的交叉激发了特定的空间模式，然后风味不稳定性传播到其他模式，否则这些模式由于非线性效应而保持稳定。我们的结果表明，快速风味转换可以在休克前区域上升，并对风味含量产生足够的影响。
In environments with high dense neutrino gases, such as in core-collapse supernovae, the neutrinos can experience collective neutrino oscillation due to their self-interactions. In particular, fast flavor conversion driven by the crossings in the neutrino angular distribution can affect explosion mechanism, nucleosynthesis, and neutrino observation. We perform the numerical computation of nonlinear flavor evolution on the neutrino angular distribution with tiny crossings expected to be generated in the preshock region. We demonstrate that the fast instability is triggered and a cascade develops under a realistic three-flavor model considering muon production and weak magnetism in the SN dynamics. The tiny crossing excites specific spatial modes, and then the flavor instability propagates into other modes which otherwise remain stable due to the nonlinear effects. Our results indicate that fast flavor conversion can rise in the preshock region and have a sufficient impact on the flavor contents.