论文标题
弥漫性超新星中微子背景作为晚期中微子质量产生的探针
The diffuse supernova neutrino background as a probe of late-time neutrino mass generation
论文作者
论文摘要
来自旧超新星爆炸的遗物中微子是实验范围内最古老的中微子通量之一。因此，如果过去中微子群众不同（RedShifts $ Z \ Lessim 5 $），则弥漫性超新星中微子背景（DSNB）可以教给我们。超新星内部内部的振荡在很大程度上取决于中微子质谱差和混合角度的值，从而使DSNB能谱对这些参数的变化敏感。考虑到中微子质量的纯粹现象学参数化是红移的函数，我们在地球上计算了预期的局部DSNB频谱。鉴于当前对中微子振荡参数的了解，特别是$ | u_ {e3} |^2 $很小的事实，我们发现$ν_e$ spectrum可能与$ z \ gtrsim1 $有效地质量质量相同，因为$ z \ gtrsim1 $是neutrino群众订单的长期，因此与标准期望有很大不同。另一方面，预计$ \overlineν_e$ flux不会受到重大影响。因此，DSNB的中微子和抗肿瘤成分的测量应允许人们测试最近中微子质量产生的可能性。
The relic neutrinos from old supernova explosions are among the most ancient neutrino fluxes within experimental reach. Thus, the diffuse supernova neutrino background (DSNB) could teach us if neutrino masses were different in the past (redshifts $z\lesssim 5$). Oscillations inside the supernova depend strongly on the neutrino mass-squared differences and the values of the mixing angles, rendering the DSNB energy spectrum sensitive to variations of these parameters. Considering a purely phenomenological parameterization of the neutrino masses as a function of redshift, we compute the expected local DSNB spectrum here on Earth. Given the current knowledge of neutrino oscillation parameters, specially the fact that $|U_{e3}|^2$ is small, we find that the $ν_e$ spectrum could be significantly different from standard expectations if neutrinos were effectively massless at $z\gtrsim1$ as long as the neutrino mass ordering is normal. On the other hand, the $\overlineν_e$ flux is not expected to be significantly impacted. Hence, a measurement of both the neutrino and antineutrino components of the DSNB should allow one to test the possibility of recent neutrino mass generation.
