Suppression of the multi-azimuthal-angle instability in dense neutrino gas during supernova accretion phase
Suppression of the multi-azimuthal-angle instability in dense neutrino gas during supernova accretion phase
复制标题
超新星吸积阶段稠密中微子气体多方位角不稳定性的抑制
DOI：
10.1103/physrevd.89.093001
复制
发表时间：
2014
影响因子：
5
通讯作者：
David de Sousa Seixas
中科院分区：
文献类型：
--
作者：
S. Chakraborty;A. Mirizzi;N. Saviano;David de Sousa Seixas
最近有人指出，去除超新星中微子的中微子-中微子相互作用中的“多角效应”的轴对称性，将产生一种新的多方位角（MAA）不稳定性。特别是，对于通量顺序Fe > Fe > Fx，正如在SN吸积阶段所预期的那样，这种不稳定性发生在正常的中微子质量体系中。然而，在这个阶段，普通物质的密度可能大于中微子的密度，从而抑制了自诱导转换。在这方面，我们调查的物质抑制的MAA效应，进行线性化的稳定性分析的中微子运动方程，在现实的SN密度分布的存在下。我们将这些结果与SN中微子非线性演化方程的数值解进行了比较。我们发现，大物质项强烈抑制MAA效应。特别是，阻碍变得更强，包括现实的前峰中微子角分布。其结果是，在我们的模型为10.8 M的超导铁芯SNe，MAA不稳定性不会引发任何口味的转换过程中的吸积阶段。相反，对于8.8 M的HNO-Ne-Mg核心SN模型，具有较低的物质密度分布和较少的前向峰角分布，风味转换也可能在早期。
It has been recently pointed out that removing the axial symmetry in the "multi-angle effects" associated with the neutrino-neutrino interactions for supernova (SN) neutrinos, a new multi- azimuthal-angle (MAA) instability would arise. In particular, for a flux ordering Fe > Fe > Fx, as expected during the SN accretion phase, this instability occurs in the normal neutrino mass hier- archy. However, during this phase the ordinary matter density can be larger than the neutrino one, suppressing the self-induced conversions. At this regard, we investigate the matter suppression of the MAA effects, performing a linearized stability analysis of the neutrino equations of motion, in the presence of realistic SN density profiles. We compare these results with the numerical solution of the SN neutrino non-linear evolution equations. We find that the large matter term strongly inhibits the MAA effects. In particular, the hindrance becomes stronger including realistic forward- peaked neutrino angular distributions. As a result, in our model for a 10.8 M⊙ iron-core SNe, MAA instability does not trigger any flavor conversion during the accretion phase. Instead, for a 8.8 M⊙ O-Ne-Mg core SN model, with lower matter density profile and less forward-peaked angular distributions, flavor conversions are possible also at early times.