Instability in the dense supernova neutrino gas with flavor-dependent angular distributions.
Instability in the dense supernova neutrino gas with flavor-dependent angular distributions.
复制标题
致密超新星中微子气体的不稳定性，具有与味道相关的角分布。
DOI：
10.1103/physrevlett.108.231102
复制
发表时间：
2011
影响因子：
8.6
通讯作者：
P. Serpico
中科院分区：
文献类型：
--
作者：
A. Mirizzi;P. Serpico
通常对超新星中中微子（ν's）的自诱导味转换的描述是基于一个简化的假设，即所有不同种类的ν's都是由一个共同的中微子层“半各向同性”发射的，类似于黑体发射。然而，现实的超新星模拟表明，在退耦的ν角分布是远远不是半各向同性的，最重要的是，是味道依赖。我们发现，风味依赖的角分布可能会导致交叉点的角谱不同ν物种（其中F（ν（e））=F（ν（x））和F（ν（e））=F（ν（x），周围的一个新的多角度不稳定性可以发展。为了描述这种效应，我们进行了线性化的风味稳定性分析不同的超新星中微子角分布。我们发现，这种不稳定性可以将风味转换的开始向低半径移动，并产生与平凡ν发射模型发现的分裂特征的涂抹。因此，不同风味的ν之间的光谱差异可以大大减少。
The usual description of self-induced flavor conversions for neutrinos (ν's) in supernovae is based on the simplified assumption that all the ν's of the different species are emitted "half-isotropically" by a common neutrinosphere, in analogy to a blackbody emission. However, realistic supernova simulations show that ν angular distributions at decoupling are far from being half-isotropic and, above all, are flavor dependent. We show that flavor-dependent angular distributions may lead to crossing points in the angular spectra of different ν species (where F(ν(e))=F(ν(x)) and F(ν(e))=F(ν(x))) around which a new multiangle instability can develop. To characterize this effect, we carry out a linearized flavor stability analysis for different supernova neutrino angular distributions. We find that this instability can shift the onset of the flavor conversions toward low radii and produce a smearing of the splitting features found with trivial ν emission models. As a result the spectral differences among ν's of different flavors could be strongly reduced.