Fast neutrino flavor conversion modes in multidimensional core-collapse supernova models: The role of the asymmetric neutrino distributions

Fast neutrino flavor conversion modes in multidimensional core-collapse supernova models: The role of the asymmetric neutrino distributions
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多维核心塌陷超新星模型中的快速中微子味道转换模式:不对称中微子分布的作用

DOI:
10.1103/physrevd.101.043016
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发表时间:
2020
期刊:
影响因子:
5
通讯作者:
Volpe Maria Cristina
Volpe Maria Cristina
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Abbar Sajad;Duan Huaiyu;Sumiyoshi Kohsuke;Takiwaki Tomoya;Volpe Maria Cristina

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一种稠密的中微子气体,如在超新星环境中预期的那样,可以经历快速的中微子味道转换,其规模可能比在真空中预期的要短得多,前提是它们的角分布和相互交叉。在a和前驱模型的多维计算中,我们详细地研究了在核坍缩超新星的反弹后阶段,通过求解一些有代表性的快照的固定物质剖面的Boltzmann方程所得到的中微子角分布。尽管该模型在不同的时间快照上显示了角交叉和相关的快速模式,但该模型并未显示去耦区内的任何交叉。我们表明,这可以通过研究中微子分布的多极分量来理解。事实上,在中微子分布的多极分量足够强的区域,发生角交叉的几率更高。我们还表明,和的角分布之间可能存在不止一个交叉点。此外,除了中微子去耦合区的交叉外,还有一类角交叉出现在质子中子星的深处。
A dense neutrino gas, such as the one anticipated in the supernova environment, can experience fast neutrino flavor conversions on scales much shorter than those expected in vacuum probably provided that the angular distributions ofandcross each other. We perform a detailed investigation of the neutrino angular distributions obtained by solving the Boltzmann equations for fixed matter profiles of some representative snapshots during the postbounce phase of core-collapse supernovae in multidimensional calculations of aand aprogenitor model. Although themodel featuresangular crossings and the associated fast modes at different time snapshots, themodel does not show any crossings within the decoupling region. We show that this can be understood by studying the multipole components of the neutrino distributions. In fact, there is a higher chance for the occurrence ofangular crossings for the zones where the multipole components of the neutrino distributions are strong enough. We also show that there can exist more than one crossing between the angular distributions ofand. In addition, apart from the crossings within the neutrino decoupling region, there is a class ofangular crossings that appears very deep inside the protoneutron star.
有限温度和密度下的中子色散
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DOI: --
发表时间: 2013
期刊:
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