论文标题
快速振荡，无碰撞放松和超新星中微子风味的虚假演变
Fast oscillations, collisionless relaxation, and spurious evolution of supernova neutrino flavor
论文作者
论文摘要
越来越多的证据表明，中微子可能至少在某些核心崩溃的超新星中进行快速风味转化（FFC）。但是，FFC的结果仍然高度不确定。在这里，我们研究了动量空间中大的角度尺度到小尺度的一系列风味场功率，这表明FFC增强了这一过程，从而加快了放松的速度。 Cascade还提出了一个计算挑战，即使风味场稳定，也存在该计算挑战：当功率达到计算的最小角度时，从截断角度伸展的误差会传播回到较大的尺度，从而造成对整体进化的影响。本质上，同样的问题促使在等离子体动力学的背景下进行了广泛的工作。该链接提出了避免虚假进化的新方法，该问题目前对现实振荡计算的可行性造成了严重限制。
Mounting evidence indicates that neutrinos likely undergo fast flavor conversion (FFC) in at least some core-collapse supernovae. Outcomes of FFC, however, remain highly uncertain. Here we study the cascade of flavor-field power from large angular scales in momentum space down to small ones, showing that FFC enhances this process and thereby hastens relaxation. Cascade also poses a computational challenge, which is present even if the flavor field is stable: When power reaches the smallest angular scale of the calculation, error from truncating the angular-moment expansion propagates back to larger scales, to disastrous effect on the overall evolution. Essentially the same issue has prompted extensive work in the context of plasma kinetics. This link suggests new approaches to averting spurious evolution, a problem that presently puts severe limitations on the feasibility of realistic oscillation calculations.
