论文标题
多维Boltzmann Neutrino运输代码，全面相对论，用于核心冲突模拟
Multidimensional Boltzmann Neutrino Transport Code in Full General Relativity for Core-collapse Simulations
论文作者
论文摘要
我们为核心偏转模拟开发了中微子传输代码，该代码直接以完全的一般相对性解决了多维Boltzmann方程。我们采用离散的纵坐标方法，该方法分散了六个维相空间。该代码是我们特殊的相对论代码与牛顿流体动力学代码相结合的范围的扩展，该代码目前用于核心偏离超新星模拟。为了证明我们的代码治疗一般相对论效应的能力，我们进行了一些测试：我们首先计算Schwarzschild和Kerr SpaceTime中中微子的自由流，并将结果与测量曲线进行比较；在Schwarzschild案例中，我们不仅在球形对称性下在空间中部署一个1维网格，而且在轴对称下的二维空间网格中也部署了一个二维空间网格，以评估该代码的能力来计算中微子的空间对流；其次，我们在固定物质背景下计算中微子的传输，该中微子转运是从核心偏曲的超新星模拟中采用的，它使用我们的一般相对论但球面对称的玻尔兹曼 - 杂草动力学代码，以获得稳定的中微子分布。将结果与后一个代码给出的结果进行了比较。
We develop a neutrino transfer code for core-collapse simulations, that directly solves the multidimensional Boltzmann equations in full general relativity. We employ the discrete ordinate method, which discretizes the six dimensional phase space. The code is an extension of our special relativistic code coupled to a Newtonian hydrodynamics code, which is currently employed for core-collapse supernova simulations. In order to demonstrate our code's capability to treat general relativistic effects, we conduct some tests: we first compute the free streaming of neutrinos in the Schwarzschild and Kerr spacetimes and compare the results with the geodesic curves; in the Schwarzschild case we deploy not only a 1-dimensional grid in space under spherical symmetry but also a 2-dimensional spatial mesh under axisymmetry in order to assess the capability of the code to compute the spatial advection of neutrinos; secondly, we calculate the neutrino transport in a fixed matter background, which is taken from a core-collapse supernova simulation with our general relativistic but spherically symmetric Boltzmann-hydrodynamics code, to obtain a steady neutrino distribution; the results are compared with those given by the latter code.
