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arXiv 2402.09274astro-ph.HEhep-ph
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中微子味变换的矩方法:在中子星合并中快味不稳定性的应用

Neutrino flavor transformation with moments: application to fast flavor instabilities in neutron star mergers

Julien Froustey, Sherwood Richers, Evan Grohs, Samuel D. Flynn, Francois Foucart, James P. Kneller, Gail C. McLaughlin

AI总结:

本研究基于三维中子星合并模拟,采用扩展的二阶矩形式化和线性稳定性分析,探究了中微子快味振荡的特征,并通过与局部三维双味模拟对比,验证了矩方法在不稳定性增长率与长度尺度上的有效性。

摘要:

中微子演化因其对爆炸性核合成的影响,在中子星合并(NSMs)等环境中非常重要,但由于高度复杂性以及可能的味转换机制的多样性,目前仍知之甚少。在本研究中,我们关注所谓的“快味振荡”,它可在纳秒级时间尺度上发生,并与电子(反)中微子角分布之间存在交叉的存在有关。基于从三维中子星合并模拟中提取的中微子辐射场,我们采用中微子量子动力学的二阶矩形式化的扩展,并进行线性稳定性分析,以确定整个模拟中快味不稳定性的特征。我们将结果与使用矩方法或粒子网格架构的局部(厘米级)三维双味模拟进行了比较。我们在不稳定性增长率和典型不稳定性长度尺度上获得了总体良好的一致性,尽管矩方法中使用的闭合的不完善之处仍有待更好地理解。

英文摘要:

Neutrino evolution, of great importance in environments such as neutron star mergers (NSMs) because of their impact on explosive nucleosynthesis, is still poorly understood due to the high complexity and variety of possible flavor conversion mechanisms. In this study, we focus on so-called "fast flavor oscillations", which can occur on timescales of nanoseconds and are connected to the existence of a crossing between the angular distributions of electron (anti)neutrinos. Based on the neutrino radiation field drawn from a three dimensional neutron star merger simulation, we use an extension of the two-moment formalism of neutrino quantum kinetics, and perform a linear stability analysis to determine the characteristics of fast flavor instabilities across the simulation. We compare the results to local (centimeter-scale) three-dimensional two-flavor simulations using either a moment method or a particle-in-cell architecture. We get generally good agreement in the instability growth rate and typical instability lengthscale, although the imperfections of the closure used in moment methods remain to be better understood.

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