Fast Flavor Transformations
Fast Flavor Transformations
复制标题
快速风味转变
DOI：
10.1007/978-981-15-8818-1_125-1
复制
发表时间：
2022
影响因子：
6.4
通讯作者：
M. Sen
中科院分区：
文献类型：
--
作者：
S. Richers;M. Sen
中微子快速风味不稳定性（FFI）可以在纳秒级时间尺度和厘米级长度尺度上改变中微子的风味。预计它在核心坍缩的超新星和中子星合并中无处不在，可能会改变我们看到的中微子信号，改变这些爆炸中物质喷射的方式，以及在喷射物中形成并丰富宇宙的重元素的类型。最近人们对FFI在超新星和合并中的作用有了很大的兴趣，但是短的长度和时间尺度以及强烈的非线性使得FFI无法始终包含在这些模型中。我们回顾了FFI的理论本质，从量子动力学方程开始，其中不稳定性存在于中子星合并和超新星中，以及在简化模拟中饱和后不稳定性的表现。我们回顾了在基于矩的计算中测试不稳定性的方法，其中不存在完整的分布，并描述了直接模拟不稳定性的数值方法。最后，我们通过概述现实的、自洽的模型的轨迹来结束，这些模型将使我们更全面地了解FFI在超新星和合并中的影响。
The neutrino fast flavor instability (FFI) can change neutrino flavor on time scales of nanoseconds and length scales of centimeters. It is expected to be ubiquitous in core-collapse supernovae and neutron star mergers, potentially modifying the neutrino signal we see, how matter is ejected from these explosions, and the types of heavy elements that form in the ejecta and enrich the universe. There has been a great deal of recent interest in understanding the role the FFI plays in supernovae and mergers, but the short length and time scales and the strong nonlinearity have prevented the FFI from being included consistently in these models. We review the theoretical nature of the FFI starting with the quantum kinetic equations, where the instability exists in neutron star mergers and supernovae, and how the instability behaves after saturation in simplified simulations. We review the proposed methods to test for instability in moment-based calculations where the full distribution is not available and describe the numerical methods used to simulate the instability directly. Finally, we close by outlining the trajectory toward realistic, self-consistent models that will allow a more complete understanding of the impact of the FFI in supernovae and mergers.