标题： 从ACT DR6 CMB透镜约束暗物质-暗能量散射 显示英文标题

标题： Constraints on Dark Matter-Dark Energy Scattering from ACT DR6 CMB Lensing

摘要： 基于宇宙微波背景（CMB）各向异性数据预测的当今物质涨落幅度有时与晚期结构的更直接测量结果存在差异。 这促使了许多对标准宇宙学模型的扩展，包括暗物质和暗能量之间的动能相互作用，这种相互作用引入了一种阻力效应，减缓了晚期结构的增长。 探索这一情景，我们通过计算在这种相互作用以及可变暗能量状态方程下的临界过密性，发展了物质功率谱在准线性尺度上的模型。 在这个模型中，我们明确避免了非线性尺度上的数据建模或解释（例如使用 $\Lambda$冷暗物质校准先验），因为这需要数值模拟。 我们发现阻力效应的存在阻碍了晕的形成，从而增加了与 $\Lambda$冷暗物质在温和非线性区域的偏差。 我们利用阿塔卡马宇宙学望远镜第六次数据发布中的CMB透镜观测数据（结合普朗克、斯隆数字巡天和6dFGS数据）到 $L=1250$，得出了迄今为止对阻力项幅度最强的限制，发现无量纲相互作用强度 $\Gamma_\mathrm{DMDE}/(H_0\rho_\mathrm{c})<0.831\; (2.81)$在68%（95%）置信水平上。 相比于线性理论，非线性修正的加入使我们的约束提高了约35%。 我们的结果并未排除先前研究中使用星系弱透镜信息得到的最佳拟合值 $\Gamma_\mathrm{DMDE}$，尽管我们没有发现统计学上对暗物质-暗能量动能相互作用相对于 $\Lambda$冷暗物质的偏好。 我们在CLASS代码的公共分支中实现了我们的模型，地址为https://github.com/fmccarthy/Class_DMDE。 显示英文摘要

摘要： The predicted present-day amplitude of matter fluctuations based on cosmic microwave background (CMB) anisotropy data has sometimes been found discrepant with more direct measurements of late-time structure. This has motivated many extensions to the standard cosmological model, including kinetic interactions between dark matter and dark energy that introduce a drag force slowing the growth of structure at late times. Exploring this scenario, we develop a model for quasi-linear scales in the matter power spectrum by calculating the critical overdensity in the presence of this interaction and a varying dark energy equation of state. We explicitly avoid modeling or interpretation of data on non-linear scales in this model (such as use of $\Lambda$CDM-calibrated priors), which would require numerical simulations. We find that the presence of the drag force hinders halo formation, thus increasing the deviation from $\Lambda$CDM in the mildly non-linear regime. We use CMB lensing observations from the sixth data release of the Atacama Cosmology Telescope up to $L=1250$ (in combination with Planck, Sloan Digital Sky Survey, and 6dFGS data) to derive the strongest constraints to date on the amplitude of the drag term, finding the dimensionless interaction strength $\Gamma_\mathrm{DMDE}/(H_0\rho_\mathrm{c})<0.831\; (2.81)$ at the 68\% (95\%) confidence level. The inclusion of non-linear corrections improves our constraints by about 35\% compared to linear theory. Our results do not exclude the best-fit values of $\Gamma_\mathrm{DMDE}$ found in previous studies using information from galaxy weak lensing, though we find no statistical preference for the dark matter-dark energy kinetic interactions over $\Lambda$CDM. We implement our model in a publicly available fork of the Boltzmann code CLASS at https://github.com/fmccarthy/Class_DMDE.