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arXiv 1608.00802astro-ph.CO
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超轻轴子暗物质的宇宙学粒子模拟

Cosmological particle-in-cell simulations with ultralight axion dark matter

Jan Veltmaat, Jens C. Niemeyer

摘要:

我们研究了超轻轴子暗物质或“模糊暗物质”(FDM)的宇宙结构形成,使用粒子网格方案来解释薛定谔-泊松方程的马德隆公式中产生的量子压力。子能级能量守恒和正确的线性行为证明。尽管该代码产生了与薛定谔方程的直接模拟相同的核心晕轮廓,但它没有再现详细的干涉图案。在FDM初始条件下的宇宙学模拟中,我们发现在量子Jeans长度附近的功率谱中,与使用具有相同初始条件的标准N体代码相比,最大相对差为O($10\%$)。这表明,在对由超轻轴子组成的暗物质成分进行精确约束时,不能忽略非线性结构形成过程中量子压力的影响。

英文摘要:

We study cosmological structure formation with ultralight axion dark matter, or "fuzzy dark matter (FDM), using a particle-mesh scheme to account for the quantum pressure arising in the Madelung formulation of the Schrödinger-Poisson equations. Subpercent-level energy conservation and correct linear behavior are demonstrated. Whereas the code gives rise to the same core-halo profiles as direct simulations of the Schrödinger equation, it does not reproduce the detailed interference patterns. In cosmological simulations with FDM initial conditions, we find a maximum relative difference of O($10\%$) in the power spectrum near the quantum Jeans length compared to using a standard N-body code with identical initial conditions. This shows that the effect of quantum pressure during nonlinear structure formation cannot be neglected for precision constraints on a dark matter component consisting of ultralight axions.

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