论文标题
部分可观测时空混沌系统的无模型预测
Effects of Different Closure Choices in Core-Collapse Supernova Simulations
论文作者
论文摘要
两臂法被广泛用于近似核心偏循环超新星（CCSN）模拟中的完整中微子传输方程，并且不同的封闭导致模拟结果的细微差异。在本文中，我们将封闭选择对1D和2D时间依赖性CCSN模拟中各种物理量的影响与我们的多组辐射流体动力学代码Fornax进行了比较。我们发现，三阶封闭关系的选择仅影响时间依赖性模拟。二阶闭合关系的选择比三阶关闭DO的选择具有更大的后果，但是与由于某些物理输入（例如状态核方程）在某些物理输入中的歧义而导致的剩余差异相比，这些选择仍然很小。我们还发现，爱丁顿因素的偏差与物理量的偏差无关，这意味着简单地比较爱丁顿因素并不能告知一个闭合效果更好。
The two-moment method is widely used to approximate the full neutrino transport equation in core-collapse supernova (CCSN) simulations, and different closures lead to subtle differences in the simulation results. In this paper, we compare the effects of closure choices on various physical quantities in 1D and 2D time-dependent CCSN simulations with our multi-group radiation hydrodynamics code Fornax. We find that choices of the 3rd-order closure relations influence the time-dependent simulations only slightly. Choices of the 2nd-order closure relation have larger consequences than choices of the 3rd-order closure do, but these are still small compared to the remaining variations due to ambiguities in some physical inputs such as the nuclear equation of state. We also find that deviations in Eddington factors are not monotonically related to deviations in physical quantities, which means that simply comparing the Eddington factors does not inform one concerning which closure is better.
