论文标题
阐述快速集体中微子风味振荡的最终命运
Elaborating the Ultimate Fate of Fast Collective Neutrino Flavor Oscillations
论文作者
论文摘要
中微子和抗肿瘤的致密云可以表现出快速的集体风味振荡。以前，在物理中。莱特牧师。 126（2021）061302，我们提出这种风味振荡导致去极化，即，口味的不可逆混合，其范围取决于不同口味的初始动量分布。在本文中，我们详细阐述并扩展了该建议，并将其与文献中的相关结果进行比较。我们对快速味道摆的下部休息点提出了准确的分析估计，并强调了放松机制，即横向松弛，多极级联反应和风味波的混合，从而使其沉降。我们估计去极化的程度，其对动量和净麻一不对称的依赖性以及对三种口味的概括。最后，我们规定了可用于超新星/核合成模拟和超新星中微子现象学的去极化分布和通量的近似分析食谱。
Dense clouds of neutrinos and antineutrinos can exhibit fast collective flavor oscillations. Previously, in Phys. Rev. Lett. 126 (2021) 061302, we proposed that such flavor oscillations lead to depolarization, i.e., an irreversible mixing of the flavors, whose extent depends on the initial momentum distributions of the different flavors. In this paper, we elaborate and extend this proposal, and compare it with related results in the literature. We present an accurate analytical estimate for the lower resting point of the fast flavor pendulum and underline the relaxation mechanisms, i.e., transverse relaxation, multipole cascade, and mixing of flavor-waves, that cause it to settle down. We estimate the extent of depolarization, its dependence on momentum and net lepton asymmetry, and its generalization to three flavors. Finally, we prescribe approximate analytical recipes for the depolarized distributions and fluxes that can be used in supernova/nucleosynthesis simulations and supernova neutrino phenomenology.
