S8 Tension in the Context of Dark Matter–Baryon Scattering
S8 Tension in the Context of Dark Matter–Baryon Scattering
复制标题
DOI：
10.3847/2041-8213/acdb63
复制
发表时间：
2023-01
期刊：
影响因子：
--
通讯作者：
Adam He;M. Ivanov;R. An;V. Gluscevic
中科院分区：
文献类型：
--
作者：
Adam He;M. Ivanov;R. An;V. Gluscevic
我们探索了一个相互作用的暗物质（IDM）模型，该模型允许一小部分暗物质（DM）经历与重子无关的速度散射。在这种情况下，相对于冷DM情况，小尺度的结构受到抑制。利用大尺度结构的有效场理论，首次对IDM情景下的BOSS全形状星系聚类数据进行了系统分析，发现该模型改善了大尺度结构与普朗克数据之间的s8张力。在我们的分析中加入暗能量调查（DES）的S 8先验，进一步导致DM -重子散射截面的轻微~ 3σ偏好，假设DM的~ 10%相互作用并且粒子质量为1 MeV。该结果在k > 1 h Mpc−1时产生了适度的~ 20%的线性功率抑制，与其他小尺度结构观测结果一致。类似的依赖于尺度的功率抑制先前被证明有可能解决宇宙学数据集之间的s8张力。这里探索的特定IDM模型的有效性将在即将到来的星系调查中进行严格的测试，以缓解s8的紧张局势。
We explore an interacting dark matter (IDM) model that allows for a fraction of dark matter (DM) to undergo velocity-independent scattering with baryons. In this scenario, structure on small scales is suppressed relative to the cold DM scenario. Using the effective field theory of large-scale structure, we perform the first systematic analysis of BOSS full-shape galaxy clustering data for the IDM scenario, and we find that this model ameliorates the S 8 tension between large-scale structure and Planck data. Adding the S 8 prior from the Dark Energy Survey (DES) to our analysis further leads to a mild ∼3σ preference for a nonvanishing DM–baryon scattering cross section, assuming ∼10% of DM is interacting and has a particle mass of 1 MeV. This result produces a modest ∼20% suppression of the linear power at k ≲ 1 h Mpc−1, consistent with other small-scale structure observations. Similar scale-dependent power suppression was previously shown to have the potential to resolve S 8 tension between cosmological data sets. The validity of the specific IDM model explored here will be critically tested with upcoming galaxy surveys at the interaction level needed to alleviate the S 8 tension.