Oscillations and random walk of the soliton core in a fuzzy dark matter halo
Oscillations and random walk of the soliton core in a fuzzy dark matter halo
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模糊暗物质晕中孤子核心的振荡和随机游走
DOI：
10.1103/physrevd.103.023508
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发表时间：
2020
影响因子：
5
通讯作者：
Tomer D. Yavetz
中科院分区：
文献类型：
--
作者：
Xinyu Li;L. Hui;Tomer D. Yavetz
模糊暗物质（FDM）晕由靠近中心的孤子核心和外部区域的NFW状密度分布组成。以往的研究发现，孤立子核心表现出时间振荡和随机游走周围的晕中心的游览。分析一组数值模拟，我们表明，这两种现象可以理解为波干涉的结果-一个合适的叠加的地面（孤子）状态和激发态在一个固定的电位足以占这些现象的主要特点。这样的本征模分析可以揭示卫星晕在潮汐扰动下的演化。随着外晕被剥离，激发态的振幅降低，基态绝热演化。这表明减少孤子振荡和随机行走的行程，影响考虑在推导恒星加热的约束。
A Fuzzy Dark Matter (FDM) halo consists of a soliton core close to the center and an NFW-like density profile in the outer region. Previous investigations found that the soliton core exhibits temporal oscillations and random walk excursions around the halo center. Analyzing a set of numerical simulations, we show that both phenomena can be understood as the results of wave interference -- a suitable superposition of the ground (solitonic) state and excited states in a fixed potential suffices to account for the main features of these phenomena. Such an eigenmode analysis can shed light on the evolution of a satellite halo undergoing tidal disruption. As the outer halo is stripped away, reducing the amplitudes of the excited states, the ground state evolves adiabatically. This suggests diminished soliton oscillations and random walk excursions, an effect to consider in deducing constraints from stellar heating.