模糊暗物质波江座II的孤子振荡和修正约束
Soliton Oscillations and Revised Constraints from Eridanus II of Fuzzy Dark Matter
摘要：
模糊暗物质（FDM）是一种很有前途的冷暗物质的替代物。该模型由质量为$m_b \sim 10^{-22}$ eV的超轻玻色子组成，并具有量子压力支持的振荡孤子核心。在这项工作中，我们表明，孤立子密度振荡持续存在，即使在显着的潮汐剥离外晕。我们报告了两个内在的，但不同的时间尺度，分别与基态孤子波函数$τ_{00}$和孤子密度振荡$τ_\text{soliton}$，服从$τ_\text{soliton} /τ_{00} \simeq 2.3$。波江座II的中央星团（SC）有一个从$τ_\text{soliton} / τ_\text{SC} \sim 2$到$3$的特征时间尺度，这一时间尺度大大偏离了1。因此，我们证明，无论是分析和数值与三维自洽FDM模拟，由于孤子密度振荡的SC的引力加热是可以忽略不计的$m_b$。我们还表明，subhalo质量函数，形成波江座II不放置一个强有力的约束$m_b$。这些结果与Marsh & Niemeyer（2019）之前的研究结果相反。
英文摘要：
Fuzzy dark matter (FDM) has been a promising alternative to standard cold dark matter. The model consists of ultralight bosons with mass $m_b \sim 10^{-22}$ eV and features a quantum-pressure-supported solitonic core that oscillates. In this work, we show that the soliton density oscillations persist even after significant tidal stripping of the outer halo. We report two intrinsic yet distinct timescales associated, respectively, with the ground-state soliton wavefunction $τ_{00}$ and the soliton density oscillations $τ_\text{soliton}$, obeying $τ_\text{soliton} /τ_{00} \simeq 2.3$. The central star cluster (SC) in Eridanus II has a characteristic timescale $τ_\text{soliton} / τ_\text{SC} \sim 2$ to $3$ that deviates substantially from unity. As a result, we demonstrate, both analytically and numerically with three-dimensional self-consistent FDM simulations, that the gravitational heating of the SC owing to soliton density oscillations is negligible irrespective of $m_b$. We also show that the subhalo mass function to form Eridanus II does not place a strong constraint on $m_b$. These results are contrary to the previous findings by Marsh & Niemeyer (2019).
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