arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1012.1339hep-phastro-ph.GA
收藏

不同超新星中微子流量自感振荡的多角度效应

Multi-angle effects in self-induced oscillations for different supernova neutrino fluxes

Alessandro Mirizzi, Ricard Tomàs

摘要:

来自超新星(SN)核心的中微子发射的非各向同性性质可能会通过SN最深区域的中微子-中微子相互作用影响中微子系综的味道演化。我们调查的依赖这些“多角度效应”的原始SN中微子通量在三味框架。我们发现,光谱交叉的模式(能量F_v_e= F_v_x,和F_ \bar v_e= F_ \bar v_x)是决定多角度效应对风味演变的影响的关键。对于中微子光谱只呈现单交叉,不同角模的同步优于多角效应,产生已知的“准单角”演化。相反,在存在多个交叉能量的光谱时,同步是不稳定的。在这种情况下,多角度效应将产生相当大的延迟,如最近观察到的风味转换的开始。我们发现,由于在大半径的演化只有部分绝热性,多角度的抑制可以如此之强,显着影响最终的振荡中微子光谱。特别是与太阳参数相关的三味效应,可以在多角度模拟中被洗掉。

英文摘要:

The non-isotropic nature of the neutrino emission from a supernova (SN) core might potentially affect the flavor evolution of the neutrino ensemble, via neutrino-neutrino interactions in the deepest SN regions. We investigate the dependence of these "multi-angle effects" on the original SN neutrino fluxes in a three-flavor framework. We show that the pattern of the spectral crossings (energies where F_ν_e= F_ν_x, and F_\barν_e= F_\barν_x) is crucial in determining the impact of multi-angle effects on the flavor evolution. For neutrino spectra presenting only a single-crossing, synchronization of different angular modes prevails over multi-angle effects, producing the known "quasi single-angle" evolution. Conversely, in the presence of spectra with multiple crossing energies, synchronization is not stable. In this situation, multi-angle effects would produce a sizable delay in the onset of the flavor conversions, as recently observed. We show that, due to the only partial adiabaticity of the evolution at large radii, the multi-angle suppression can be so strong to dramatically affect the final oscillated neutrino spectra. In particular three-flavor effects, associated with the solar parameters, could be washed-out in multi-angle simulations.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑