Fuzzy dark matter and the Dark Energy Survey Year 1 data
Fuzzy dark matter and the Dark Energy Survey Year 1 data
复制标题
模糊暗物质和暗能量调查第一年数据
DOI：
10.1093/mnras/stac1946
复制
发表时间：
2022
影响因子：
4.8
通讯作者：
Dentler M
中科院分区：
文献类型：
--
作者：
Dentler M
暗物质晕的引力弱透镜效应导致星系的剪切相关函数中存在可测量的印记。模糊暗物质（FDM）由质量为10− 22 eV的超轻类轴子粒子组成，相对于标准冷暗物质，它抑制了物质的功率谱和剪切相关。我们使用优化的晕模型HMCode模拟FDM对宇宙剪切的影响，考虑到N体模拟中观察到的FDM中的质量函数和晕浓度的额外抑制。我们将联合收割机暗能量巡天第一年（DES-Y1）的观测数据与普朗克宇宙微波背景各向异性相结合，寻找FDM引起的剪切相关抑制。我们没有发现抑制的证据相比，首选的冷暗物质模型，从而设置一个新的FDM粒子质量的下限。使用对数平坦的先验和边缘化的非线性模型的FDM相关的不确定性，我们找到了一个新的，独立的95%的C. L。下限log 10 m> −23结合普朗克和DES-Y1剪切，相对于仅CMB约束，质量约束提高了近两个数量级。我们的分析在很大程度上是独立的重子模型，和以前的限制FDM覆盖这个质量范围。我们的分析突出了FDM非线性模型的最重要的方面，为今后的调查。如果能在晕模型中同时对FDM和重子反馈进行高精度的模拟，那么在arcmin宇宙剪切角分辨率下，弱透镜对FDM的限制可以提高三个数量级。
Gravitational weak lensing by dark matter haloes leads to a measurable imprint in the shear correlation function of galaxies. Fuzzy dark matter (FDM), composed of ultralight axion-like particles of massm∼ 10−22eV, suppresses the matter power spectrum and shear correlation with respect to standard cold dark matter. We model the effect of FDM on cosmic shear using the optimized halo modelHMCode, accounting for additional suppression of the mass function and halo concentration in FDM as observed inN-body simulations. We combine Dark Energy Survey Year 1 (DES-Y1) data with thePlanckcosmic microwave background anisotropies to search for shear correlation suppression caused by FDM. We find no evidence of suppression compared to the preferred cold dark matter model, and thus set a new lower limit to the FDM particle mass. Using a log-flat prior and marginalizing over uncertainties related to the non-linear model of FDM, we find a new, independent 95 per cent C.L. lower limit log10m> −23 combiningPlanckand DES-Y1 shear, an improvement of almost two orders of magnitude on the mass bound relative to CMB-only constraints. Our analysis is largely independent of baryonic modelling, and of previous limits to FDM covering this mass range. Our analysis highlights the most important aspects of the FDM non-linear model for future investigation. The limit to FDM from weak lensing could be improved by up to three orders of magnitude witharcmin cosmic shear angular resolution, if FDM and baryonic feedback can be simultaneously modelled to high precision in the halo model.