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arXiv 1208.0157hep-phastro-ph.SR
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具有味相关角分布的致密超新星中微子的味稳定性分析

Flavor stability analysis of dense supernova neutrinos with flavor-dependent angular distributions

Alessandro Mirizzi, Pasquale Dario Serpico

摘要:

超新星中微子自感味转换是与恒星最深区中微子-中微子相互作用有关的,其数值模拟通常采用“灯泡模型”。在这种近似下,中微子被认为是由一个普通的中微子层半各向同性地发射出来的。在最近的参考文献\cite{Mirizzi:2011tu}中,我们通过引入SN中微子的味依赖角分布来消除这个假设,正如核塌缩模拟所建议的那样。我们已经发现,在这种情况下,一个新的多角度的不稳定性,在自诱导的风味转变可能会出现。在这项工作中,我们进行了广泛的研究这种效果,进行了线性化的风味稳定性分析不同的SN中微子能量通量和角分布,在正常和倒置的中微子质量层次。我们确认,光谱的不同nu物种交叉角空间(其中F_{ν_e} = F_{ν_x}和F_{\barν_e} = F_{\barν_x})提出了一个显着增强的味道不稳定性,和偏移的发病的味道转换在较小的半径相对于各向同性中微子发射的情况下。我们还说明了如何定性(有时是定量)的了解这些系统的动态如下从稳定性分析。

英文摘要:

Numerical simulations of the supernova (SN) neutrino self-induced flavor conversions, associated with the neutrino-neutrino interactions in the deepest stellar regions, have been typically carried out assuming the "bulb-model". In this approximation, neutrinos are taken to be emitted half-isotropically by a common neutrinosphere. In the recent Ref. \cite{Mirizzi:2011tu} we have removed this assumption by introducing flavor-dependent angular distributions for SN neutrinos, as suggested by core-collapse simulations. We have found that in this case a novel multi-angle instability in the self-induced flavor transitions can arise. In this work we perform an extensive study of this effect, carrying out a linearized flavor stability analysis for different SN neutrino energy fluxes and angular distributions, in both normal and inverted neutrino mass hierarchy. We confirm that spectra of different nu species which cross in angular space (where F_{ν_e}=F_{ν_x} and F_{\barν_e}=F_{\barν_x}) present a significant enhancement of the flavor instability, and a shift of the onset of the flavor conversions at smaller radii with respect to the case of an isotropic neutrino emission. We also illustrate how a qualitative (and sometimes quantitative) understanding of the dynamics of these systems follows from a stability analysis.

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