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arXiv 2206.04097astro-ph.HEhep-exhep-phnucl-th
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快中微子-味转换的时间相关和准稳态特征

Time-dependent and quasi-steady features of fast neutrino-flavor conversion

Hiroki Nagakura, Masamichi Zaizen

摘要:

尽管理论上表明快中微子味转换(FFC)普遍存在于核心坍缩超新星和双中子星合并中,但缺乏全局模拟一直是研究其天体物理后果的最大障碍。在这封{ \it信}中,我们提出了大规模($50 {\rm km}$)模拟FFC在球对称使用一种新的方法。通过减少模拟箱中注入中微子的数量,我们有效地重新调整了FFC的振荡尺度,并利用收敛性研究外推回到中微子目标密度的情况。我们发现,所有模型中的FFC在非线性区域均达到准稳态,其饱和特性具有普适性。我们还发现,FFC的时间和空间的变化被涂抹在大半径,由于通过中微子自相互作用相抵消。最后,我们提出了一个新的诊断量,ELN-XLN角交叉,以评估FFC的非线性饱和。

英文摘要:

Despite the theoretical indication that fast neutrino-flavor conversion (FFC) ubiquitously occurs in core-collapse supernova and binary neutron star merger, the lack of global simulations has been the greatest obstacle to study their astrophysical consequences. In this {\it Letter}, we present large-scale ($50 {\rm km}$) simulations of FFC in spherical symmetry by using a novel approach. We effectively rescale the oscillation scale of FFC by reducing the number of injected neutrinos in the simulation box, and then extrapolate back to the case of the target density of neutrinos with a convergence study. We find that FFC in all models achieves quasi-steady state in the non-linear regime, and its saturation property of FFC is universal. We also find that temporal- and spatial variations of FFC are smeared out at large radii due to phase cancellation through neutrino self-interactions. Finally, we provide a new diagnostic quantity, ELN-XLN angular crossing, to assess the non-linear saturation of FFC.

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