arXiv 1606.051512016-06astro-ph.COastro-ph.GAgr-qchep-th

超轻轴子暗物质宇宙学中孤子核合并的模拟

Simulations of solitonic core mergers in ultra-light axion dark matter cosmologies

Bodo Schwabe, Jens C. Niemeyer, Jan F. Engels

备注：: 10 pages, 22 figures
发表信息：: Phys. Rev. D 94, 043513 (2016)
DOI：: 10.1103/PhysRevD.94.043513

摘要：

使用三维模拟，我们研究合并孤子核心的动力学和最终结构预测形成超轻轴子暗物质晕。自引力标量场的经典牛顿运动方程可以用薛定谔-泊松方程来描述。我们调查合并的基态（玻色子星）的配置与不同的质量比，相对相位，轨道角动量和初始分离的主要目标，以了解新兴的核心引力冷却的质量损失。证实了以前的结果表明，最终的密度分布有孤子的核心和NFW样的尾巴。在二元并合中，最终的核心质量不依赖于初始相位差或角动量，而只依赖于系统的质量比、总初始质量和总能量。对于非零角动量，原本球形的核变成旋转的椭圆体。多核合并的结果是定性相同的。

英文摘要：

Using three-dimensional simulations, we study the dynamics and final structure of merging solitonic cores predicted to form in ultra-light axion dark matter halos. The classical, Newtonian equations of motion of a self-gravitating scalar field are described by the Schrödinger-Poisson equations. We investigate mergers of ground state (boson star) configurations with varying mass ratios, relative phases, orbital angular momenta and initial separation with the primary goal to understand the mass loss of the emerging core by gravitational cooling. Previous results showing that the final density profiles have solitonic cores and NFW-like tails are confirmed. In binary mergers, the final core mass does not depend on initial phase difference or angular momentum and only depends on mass ratio, total initial mass, and total energy of the system. For non-zero angular momenta, the otherwise spherical cores become rotating ellipsoids. The results for mergers of multiple cores are qualitatively identical.

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