On the cosmic web elongation in fuzzy dark matter cosmologies: Effects on density profiles, shapes, and alignments of haloes
On the cosmic web elongation in fuzzy dark matter cosmologies: Effects on density profiles, shapes, and alignments of haloes
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模糊暗物质宇宙学中的宇宙网伸长：对密度分布、形状和晕排列的影响
DOI：
10.1093/mnras/stac3766
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发表时间：
2022
影响因子：
4.8
通讯作者：
Vogelsberger, Mark
中科院分区：
文献类型：
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作者：
Dome, Tibor;Fialkov, Anastasia;Mocz, Philip;Schäfer, Björn Malte;Boylan-Kolchin, Michael;Vogelsberger, Mark
近年来，由于香草Lambda冷暗物质（ΛCDM）宇宙学模型的小规模挑战以及缺乏任何候选粒子的实验证据，模糊暗物质（FDM）场景受到越来越多的关注。在这项研究中，我们使用宇宙n体模拟来研究高红移暗物质晕及其对原始密度扰动中小尺度fdm类功率谱截止的响应。我们通过提供拟合和量化偏离ΛCDM作为粒子质量函数来研究类fdm宇宙学中的光晕密度分布、形状和排列（后两者是首次）。与ΛCDM相比，类fdm光晕的浓度较低，在依赖光晕质量处达到峰值，从而打破了ΛCDM中密度分布的近似普遍性。在ΛCDM的n -体模拟中，中至大、小至大形状参数曲线随椭球半径单调递增。在类似fdm的宇宙学中，单调性被打破了，光晕在维里半径周围比在ΛCDM附近的光晕更拉长，而在靠近中心的地方则不那么拉长。最后，本征排列相关性，源自于最初球体坍缩晕在环境引力潮场中的变形，随着m的减小而变得更强。在Atz ~ 4中，我们发现各向同性线性排列量级的分数差异具有6.4σ-显著性（disoin = 10−22eV模型和ΛCDM）。这种类似于fdm的光晕内部特性的印记预计将在高z宇宙中非常明显。
The fuzzy dark matter (FDM) scenario has received increased attention in recent years due to the small-scale challenges of the vanilla Lambda cold dark matter (ΛCDM) cosmological model and the lack of any experimental evidence for any candidate particle. In this study, we use cosmologicalN-body simulations to investigate high-redshift dark matter haloes and their responsiveness to an FDM-like power spectrum cutoff on small scales in the primordial density perturbations. We study halo density profiles, shapes, and alignments in FDM-like cosmologies (the latter two for the first time) by providing fits and quantifying departures from ΛCDM as a function of the particle massm. Compared to ΛCDM, the concentrations of FDM-like haloes are lower, peaking at anm-dependent halo mass and thus breaking the approximate universality of density profiles in ΛCDM. The intermediate-to-major and minor-to-major shape parameter profiles are monotonically increasing with ellipsoidal radius inN-body simulations of ΛCDM. In FDM-like cosmologies, the monotonicity is broken, haloes are more elongated around the virial radius than their ΛCDM counterparts and less elongated closer to the centre. Finally, intrinsic alignment correlations, stemming from the deformation of initially spherically collapsing haloes in an ambient gravitational tidal field, become stronger with decreasingm. Atz∼ 4, we find a 6.4σ-significance in the fractional differences between the isotropized linear alignment magnitudesDisoin them= 10−22eV model and ΛCDM. Such FDM-like imprints on the internal properties of virialized haloes are expected to be strikingly visible in the high-zUniverse.