论文标题
带有模糊暗物质的完整宇宙学模拟中的光环质量功能和细丝
The halo mass function and filaments in full cosmological simulations with fuzzy dark matter
论文作者
论文摘要
模糊的暗物质（FDM）是一种暗物质候选者，由超光标量颗粒组成，质量约为$ 10^{ - 22} \ Mathrm {ev}/c^2 $，一种冷验性的机制，冷玻色物质表现为集体波，而不是单个颗粒。由于其在天体物理量表上的丰富现象学，它越来越引起人们的注意，这对标准宇宙学模型中存在的小规模张力（$λ$ CDM）产生了影响。尽管对FDM的限制正在在许多不同的情况下积累，但很少有人通过自洽的数值模拟来验证。我们使用FDM介绍了宇宙结构形成的新大型数值模拟，并使用Axirepo Code求解了完整的Schrödinger-Poisson（SP）方程，该代码实现了伪柔性数值方法。结合我们以前的模拟，它们使我们能够对物质聚类的四向比较，对比鲜明的结果（例如功率谱）（例如，FDM与CDM）和动力学（SP vs. $ n $ - $ - body）的每种组合。通过解开初始条件和非线性动力学的影响，我们可以评估以前作品中使用的近似方法的有效性，例如具有FDM初始功率谱的普通$ n $ body模拟。由于我们的FDM模拟中获得的体积相对较大，因此我们能够首次从全波模拟中测量FDM Halo质量函数，并与使用分析或近似方法获得的先前结果进行比较。我们发现，由于FDM功率谱中小规模功率的截止，光环通过整个仿真量的连续，光滑和密集的丝（与标准的$λ$ CDM功率谱不同）链接，对可靠识别的光晕构成了重大挑战。我们还研究了这些丝的密度曲线，并与它们的CDM对应物进行了比较。
Fuzzy dark matter (FDM) is a dark matter candidate consisting of ultra-light scalar particles with masses around $10^{-22} \mathrm{eV}/c^2$, a regime where cold bosonic matter behaves as a collective wave rather than individual particles. It has increasingly attracted attention due to its rich phenomenology on astrophysical scales, with implications for the small-scale tensions present within the standard cosmological model, $Λ$CDM. Although constraints on FDM are accumulating in many different contexts, very few have been verified by self-consistent numerical simulations. We present new large numerical simulations of cosmic structure formation with FDM, solving the full Schrödinger-Poisson (SP) equations using the AxiREPO code, which implements a pseudo-spectral numerical method. Combined with our previous simulations, they allow us to draw a four-way comparison of matter clustering, contrasting results (such as power spectra) for each combination of initial conditions (FDM vs. CDM) and dynamics (SP vs. $N$-body). By disentangling the impact of initial conditions and non-linear dynamics, we can gauge the validity of approximate methods used in previous works, such as ordinary $N$-body simulations with an FDM initial power spectrum. Due to the comparatively large volume achieved in our FDM simulations, we are able to measure the FDM halo mass function from full wave simulations for the first time, and compare to previous results obtained using analytic or approximate approaches. We find that, due to the cut-off of small-scale power in the FDM power spectrum, haloes are linked via continuous, smooth, and dense filaments throughout the entire simulation volume (unlike for the standard $Λ$CDM power spectrum), posing significant challenges for reliably identifying haloes. We also investigate the density profiles of these filaments and compare to their CDM counterparts.
