Fast oscillations, collisionless relaxation, and spurious evolution of supernova neutrino flavor

超新星中微子的碰撞味不稳定性

Collisional flavor instabilities of supernova neutrinos

针对核心坍缩超新星中集体中微子振荡影响动力学的谜题，研究发现了与中微子-反中微子作用速率不对称相关的碰撞味不稳定性，其或普遍存在于超新星内部，是热环境退相干作用引发量子相干持续增长的特例。

TeV Neutrinos and GeV Photons from Shock Breakout in Supernovae

We show that as a Type II supernova shock breaks out of its progenitor star, it becomes collisionless and may accelerate protons to energies >10 TeV. Inelastic nuclear collisions of these protons produce a ~1 hr long flash of TeV neutrinos and 10 GeV photons, about 10 hr after the thermal (10 MeV) neutrino burst from the cooling neutron star. A Galactic supernova in a red supergiant star would produce a photon and neutrino flux of ~10^{-4} erg/cm^2 s. A km^2 neutrino detector will detect ~100 muons, thus allowing to constrain both supernova models and neutrino properties.

Spurious instabilities in multiangle simulations of collective flavor conversion

The dense neutrino flux streaming from a core-collapse supernova can undergo self-induced flavor conversion caused by neutrino-neutrino refraction. Numerical studies of these nonlinear effects are challenging because representing the neutrino radiation field by discrete energy and angle bins can easily lead to unphysical solutions. In particular, if the number of angle bins N_a is too small, flavor conversion begins too deep and produces completely spurious results. At the same time, N_a=1 (single-angle approximation) can be a good proxy for the N_a -> infinity limit. Based on a linearized sta…

利用银河系矮球状星系与超新星中微子限制中微子-暗物质相互作用

Constraining neutrino-DM interactions with Milky Way dwarf spheroidals and supernova neutrinos

本文利用银河系矮球状星系暗物质密度分布，通过超新星中微子散射导致的能量注入效应，给出了中微子-暗物质散射截面的新上限，并指出该约束强于以往结果。

致密中微子等离子体中的集体味转换

Collective flavor conversion in dense neutrino plasmas

本文综述致密瞬变源中中微子等离子体的集体味转换，提出 flavomons 准粒子描述，并联系数值模拟进展，解释味不稳定性机制。

Accounting for the Heisenberg and Pauli principles in the kinetic approach to neutrino oscillations

While oscillations of solar neutrinos are usually studied using the single-particle quantum-mechanical approach, flavor conversions of supernovae neutrinos are typically analyzed using the kinetic equation for the matrix of densities due to the necessity of including also the scattering processes. Using the Wigner formulation of quantum mechanics we show the equivalence of the quantum-mechanical and kinetic approaches in the limit of collisionless neutrino propagation (in a background medium). Based on this observation we also argue that solutions of the kinetic equation account for the Heisen…