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arXiv 1104.1428astro-ph.CO
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超共动变星宇宙学模拟中DC模式的实现

Implementing the DC Mode in Cosmological Simulations with Supercomoving Variables

Nickolay Y. Gnedin, Andrey V. Kravtsov, Douglas H. Rudd

摘要:

正如以前的研究所强调的那样,正确处理宇宙学模拟体积基本尺度上的密度波动-“DC模式”-对于在大于模拟盒大小10%的尺度上精确建模空间相关性至关重要。我们提供了进一步的说明的DC模式上的晕在小盒子的丰度的影响,并表明,它是直接将这种模式的宇宙学代码中使用的“supercomoving”变量。用这些变量改写的控制暗物质和重子演化的方程特别简单,而且只在泊松方程中明确地包含了膨胀因子,因此也包含了DC模的影响。

英文摘要:

As emphasized by previous studies, proper treatment of the density fluctuation on the fundamental scale of a cosmological simulation volume - the "DC mode" - is critical for accurate modeling of spatial correlations on scales > 10% of simulation box size. We provide further illustration of the effects of the DC mode on the abundance of halos in small boxes and show that it is straightforward to incorporate this mode in cosmological codes that use the "supercomoving" variables. The equations governing evolution of dark matter and baryons recast with these variables are particularly simple and include the expansion factor, and hence the effect of the DC mode, explicitly only in the Poisson equation.

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