论文标题
二进制中微子转化的多维溶液在二进制中子合并残留物中
Multi-Dimensional Solution of Fast Neutrino Conversions in Binary Neutron Star Merger Remnants
论文作者
论文摘要
中微子的快速成对转化被预测在中子星的合并残留物中无处不在，可能对比铁重的元素的核合成有潜在的影响。我们介绍了（2+1+1）维设置中的中微子风味演变的第一个复杂的数值解：两个空间坐标，一个Angular变量和时间。我们在残留磁盘上方寻找稳态的风味构型。尽管线性稳定性分析可以预测残留磁盘上方的任何位置的风味不稳定性，但我们在非线性方案中的模拟表明，快速成对转化会导致最小的中微子混合（<1％）；在我们的模型中，从未实现风味平衡。重要的是，在（抗）中微子去耦表面边缘附近的局部区域内，快速中微子的转化率更为突出，在残留物的极性区域中几乎可以忽略不计。我们关于快速成对转换作用的发现应谨慎解释，因为与我们的设置具有内在的近似值，并倡导在更现实的框架内进行进一步的工作。
Fast pairwise conversions of neutrinos are predicted to be ubiquitous in neutron star merger remnants with potentially major implications on the nucleosynthesis of the elements heavier than iron. We present the first sophisticated numerical solution of the neutrino flavor evolution above the remnant disk within a (2+1+1) dimensional setup: two spatial coordinates, one angular variable, and time. We look for a steady-state flavor configuration above the remnant disk. Albeit the linear stability analysis predicts flavor instabilities at any location above the remnant disk, our simulations in the non-linear regime show that fast pairwise conversions lead to minimal neutrino mixing (<1%); flavor equilibration is never achieved in our models. Importantly, fast neutrino conversions are more prominent within localized regions near the edges of the (anti)neutrino decoupling surfaces and almost negligible in the polar region of the remnant. Our findings on the role of fast pairwise conversions should be interpreted with caution because of the approximations intrinsic to our setup and advocate for further work within a more realistic framework.
