论文标题
银河系的平衡轴对称光环模型及其对直接和间接DM搜索的影响
Equilibrium axisymmetric halo model for the Milky Way and its implications for direct and indirect DM searches
论文作者
论文摘要
我们首次为银河系暗物质（DM）光环提供了自洽的轴对称相位空间分布模型，通过贝叶斯分析，它们仔细匹配了最新的运动学测量。通过在各个银河系组件上使用广泛的先验，我们得出了进入直接和间接DM搜索解释的天体物理因素的保守估计。虽然所得的DM密度曲线与以前的研究非常吻合，但这意味着$ρ_\ odot \大约10^{ - 2} \，m_ \ odot / \ odot / \ mathrm {pc}^3 $，baryonic盘的存在导致与当地DM速度分布相比，与标准的Halo模型相比，本地DM Velocity分布有显着差异。为了直接检测，这意味着在检测器附近的DM质量处的横截面限制约30％，最大敏感性较低，在质量范围的下端较低的限制较低。此外，通过为即将到来的Darwin和Darkside-20K实验进行蒙特卡洛模拟，我们证明，在成功检测出重量低于当前限制的重型DM时，精心构造的轴对称模型可以消除偏见，可以消除偏见，并使不确定性在调整后的dm散布和群众中降低了50％，但也可以更加可靠地确定，但也可以更加可靠地确定，并在群众中得到了更多的帮助。此外，由重盘诱导的速度各向异性可能导致年度调制幅度明显更大，并且在预期DM诱导的事件的方向分布上存在很大的差异。对于间接搜索，我们提供差异$ J $因素，并计算相对速度分布的一些时刻，这些时刻是预测速度依赖性an灭率的相对速度分布。但是，我们发现关于银河中心附近的DM分布的大量不确定性仍然阻碍了准确的预测。
We for the first time provide self-consistent axisymmetric phase-space distribution models for the Milky Way's dark matter (DM) halo which are carefully matched against the latest kinematic measurements through Bayesian analysis. By using broad priors on the individual galactic components, we derive conservative estimates for the astrophysical factors entering the interpretation of direct and indirect DM searches. While the resulting DM density profiles are in good agreement with previous studies, implying $ρ_\odot \approx 10^{-2} \, M_\odot / \mathrm{pc}^3$, the presence of baryonic disc leads to significant differences in the local DM velocity distribution in comparison with the standard halo model. For direct detection, this implies roughly 30% stronger cross-section limits at DM masses near detectors maximum sensitivity and up to an order of magnitude weaker limits at the lower end of the mass range. Furthermore, by performing Monte-Carlo simulations for the upcoming DARWIN and DarkSide-20k experiments, we demonstrate that upon successful detection of heavy DM with coupling just below the current limits, the carefully constructed axisymmetric models can eliminate bias and reduce uncertainties by more then 50% in the reconstructed DM coupling and mass, but also help in a more reliable determination of the scattering operator. Furthermore, the velocity anisotropies induced by the baryonic disc can lead to significantly larger annual modulation amplitude and sizable differences in the directional distribution of the expected DM-induced events. For indirect searches, we provide the differential $J$-factors and compute several moments of the relative velocity distribution that are needed for predicting the rate of velocity-dependent annihilations. However, we find that accurate predictions are still hindered by large uncertainties regarding the DM distribution near the galactic center.
