论文标题
晚期中微子排放对弥漫性超新星中微子背景的影响
Impact of late-time neutrino emission on the diffuse supernova neutrino background
论文作者
论文摘要
在没有高统计量超新星中微子测量值的情况下，对核心偏离超新星模拟精确度的弥漫性超新星中微子背景（DSNB）铰链的估计值。了解核心恒星（PNS）进化的冷却阶段（$ \ gtrsim1 \，{\ rm s} $后核心弹跳）至关重要，因为在冷却阶段发出了中微子约50％的中微子的能量的约50％。我们通过将3D流体动力模拟预测的中微子发射与几个冷却相估计值相结合，其中包括新型的两参数相关性，具体取决于最终的Baryonic PNS质量和冲击复兴时间，我们将冷却阶段与混合方法建模。我们发现，根据冷却相处理，超级卡米坎德（Super-Kamiokande）的预测DSNB事件率可能会因$ \ sim2-3 $而变化。我们还发现，除了一个冷却估计值外，预测的DSNB事件的范围在很大程度上是由中微子平均能量的不确定性驱动的。有了很好的了解，可以为下一代DSNB搜索做出更精确的DSNB估计。
In the absence of high-statistics supernova neutrino measurements, estimates of the diffuse supernova neutrino background (DSNB) hinge on the precision of simulations of core-collapse supernovae. Understanding the cooling phase of protoneutron star (PNS) evolution ($\gtrsim1\,{\rm s}$ after core bounce) is crucial, since approximately 50% of the energy liberated by neutrinos is emitted during the cooling phase. We model the cooling phase with a hybrid method by combining the neutrino emission predicted by 3D hydrodynamic simulations with several cooling-phase estimates, including a novel two-parameter correlation depending on the final baryonic PNS mass and the time of shock revival. We find that the predicted DSNB event rate at Super-Kamiokande can vary by a factor of $\sim2-3$ depending on the cooling-phase treatment. We also find that except for one cooling estimate, the range in predicted DSNB events is largely driven by the uncertainty in the neutrino mean energy. With a good understanding of the late-time neutrino emission, more precise DSNB estimates can be made for the next generation of DSNB searches.
