Investigating the influence of magnetic fields upon structure formation with AMIGA - a C code for cosmological magnetohydrodynamics
Investigating the influence of magnetic fields upon structure formation with AMIGA - a C code for cosmological magnetohydrodynamics
复制标题
使用 AMIGA（宇宙磁流体动力学 C 代码）研究磁场对结构形成的影响
DOI：
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
A. Knebe
中科院分区：
文献类型：
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作者：
Timur Doumler;A. Knebe
尽管观测方法有了很大改进，但宇宙尺度上磁场的存在及其在大规模结构形成过程中的作用仍然不清楚。在本文中，我们想要解决大尺度假设的原始磁场的存在如何影响数值模拟中的宇宙结构形成的问题。作为进行此类模拟的工具，我们推出了新的数字代码 AMIGA 。它将 N 体代码与基于欧拉网格的求解器相结合，用于全套磁流体动力学 (MHD) 方程组，以便在完全宇宙学环境中以自洽的方式对暗物质、重子和磁场进行模拟。我们的数值方案包括确保正确捕获冲击和高超音速流以及无发散磁场的有效方法。大量数值测试证明了该代码的高精度。然后，我们提出了一系列宇宙学 MHD 模拟，并证实，为了对大尺度上的物质分布产生重大影响，原始磁场强度必须显着高于当前的观测和理论限制。
Despite greatly improved observational methods, the presence of magnetic fields at cosmological scales and their role in the process of large-scale structure formation still remain unclear. In this paper, we want to address the question how the presence of a hypothetical primordial magnetic field on large scales influences the cosmic structure formation in numerical simulations. As a tool for carrying out such simulations, we present our new numerical code AMIGA . It combines an N-body code with an Eulerian grid-based solver for the full set of magnetohydrodynamics (MHD) equations in order to conduct simulations of dark matter, baryons and magnetic fields in a self-consistent way in a fully cosmological setting. Our numerical scheme includes effective methods to ensure proper capturing of shocks and highly supersonic flows and a divergence-free magnetic field. The high accuracy of the code is demonstrated by a number of numerical tests. We then present a series of cosmological MHD simulations and confirm that, in order to have a significant effect on the distribution of matter on large scales, the primordial magnetic field strength would have to be significantly higher than the current observational and theoretical constraints.
影响因子：
8.7
作者：
Komatsu, E.;Smith, K. M.;Wright, E. L.
通讯作者：
Wright, E. L.