论文标题
快速中微子味转换的时间依赖和准态特征
Time-dependent and quasi-steady features of fast neutrino-flavor conversion
论文作者
论文摘要
尽管理论上表明快速中微子味转化率（FFC）无处不在发生在核心杂散的超新星和二进制中子星星合并中，但缺乏全球模拟是研究其天体物理后果的最大障碍。在此{\ it Letter}中，我们通过使用新颖的方法提出了球形对称性中FFC的大规模（$ 50 {\ rm km} $）。我们通过减少模拟框中注射的中微子的数量来有效地重新汇总FFC的振荡量表，然后通过收敛研究将中微子的目标密度外推回目标密度。我们发现，在所有模型中，FFC均在非线性方案中达到了准稳态，其FFC的饱和性能是通用的。我们还发现，由于中微子自我互动的相位取消，FFC的时间和空间变化在大半径上被涂抹。最后，我们提供了一个新的诊断量ELN-XLN角交叉，以评估FFC的非线性饱和度。
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.
