论文标题
连接小规模与快速中微子味转换的大规模结构
Connecting small-scale to large-scale structures of fast neutrino-flavor conversion
论文作者
论文摘要
我们介绍了一项系统的快速中微子香料转化率（FFC）的系统研究，并在球形对称性中均具有小规模和大规模数值模拟。我们发现，FFC通常可以达到准稳态，而在非线性相中的这些特征并非以FFC不稳定性的生长速率，而是电子中微子Lepton数（ELN）和重量（XLN）的角度结构。我们的结果表明，即使在生长不稳定速度（例如，浅元素交叉）和狭窄的角区域（在动量空间中）的情况下，中微子也几乎可以达到风味均衡。这表明ELN和XLN角度分布无法提供足够的信息来确定所有口味的中微子和抗毒剂中的风味转化量。根据我们的数值模拟的结果，我们提供了一种新的FFC的近似方案，该方案的设计是，可以轻松地将FFC的效果纳入现有的古典中微子传输代码中，以研究核心 - 崩溃超新星（CCSN）和二元中性恒星恒星合并（BNSM）的核心崩溃。该方案具有捕获FFC的准稳态状态的关键特征，而无需求解量子动力中微子的转运，这将有助于促进CCSN和BNSM理论家访问FFCS。
We present a systematic study of fast neutrino-flavor conversion (FFC) with both small-scale and large-scale numerical simulations in spherical symmetry. We find that FFCs can, in general, reach a quasi-steady state, and these features in the non-linear phase are not characterized by the growth rate of FFC instability but rather angular structures of electron neutrino lepton number (ELN) and heavy one (XLN). Our result suggests that neutrinos can almost reach a flavor equipartition even in cases with low growth rate of instability (e.g., shallow ELN crossing) and narrow angular regions (in momentum space) where flavor conversions occur vigorously. This exhibits that ELN and XLN angular distributions can not provide a sufficient information to determine total amount of flavor conversion in neutrinos and antineutrinos of all flavors. Based on the results of our numerical simulations, we provide a new approximate scheme of FFC that is designed so that one can easily incorporate effects of FFCs in existing classical neutrino transport codes for the study of core-collapse supernova (CCSN) and binary neutron star merger (BNSM). The scheme has an ability to capture key features of quasi-steady state of FFCs without solving quantum kinetic neutrino transport, which will serve to facilitate access to FFCs for CCSN and BNSM theorists.
