标题： 在超致密结构中寻找暗物质：从大尺度到太阳系 显示英文标题

标题： Hunting Dark Matter in ultra-compact structures: from large scales to the solar system

摘要： 超紧凑微晕（UCMHs）是在早期宇宙中形成的物体，由于其中心密度大，能够抵御后来潮汐剥离的最严重影响而持续存在。 这些物体是早期宇宙物理许多细节的探测工具，例如原初相变、暴胀以及原初密度扰动场的非高斯性。 它们同时也是高度暗物质主导的物体，这意味着它们是继续寻找暗物质（DM）本质的研究对象。 我们银河系的局部环境为未来射电和$\gamma$-ray望远镜可能探测这些物体提供了有趣的前景。 它们的探测或未探测到，可以对宇宙学和大尺度结构物理提供约束。 在太阳系的局部环境中研究这类物体的另一个原因是，有假说认为与UCMHs的相遇可能在我们的太阳系内行星上引发灾难性事件，例如。 地球上的大规模灭绝事件。 所有这些论点都提供了有力的理由来确定WIMP DM有多少可能包含在这些结构中，以及其湮灭可能产生的后果。 在这项工作中，我们研究了WIMP湮灭截面与UCMHs中发现的DM最大比例之间的相互关系，利用了这些物体内部DM湮灭的多频效应，以及可以从原初扰动功率谱中进一步得出的约束。 最后，我们重新审视了“火山起源”DM导致地球大规模灭绝事件的假设。 在此过程中，我们对这一假设提出了怀疑，但建议它可能被作为火星地幔脱气的驱动力，最终关闭红星球内的地磁发电机。 显示英文摘要

摘要： Ultra-Compact Micro Halos (UCMHs) are objects formed in the early universe that persist due to their large central density inuring them to the worst effects of later tidal stripping. Such objects are probes of many details of early universe physics, such as primordial phase-transitions, inflation, and non-Gaussianity of the primordial density perturbation field. The fact that they are also highly dark matter-dominated objects means that they are attractive objects of study in the continuing hunt for the nature of Dark Matter (DM). The local environment of our Milky-Way offers interesting perspectives for their possible detection with future radio and $\gamma$-ray telescopes. Their detection, or lack thereof, providing constraints on both cosmology and large-scale structure physics. Another reason to study such objects in the local environment of the solar system is found in the conjecture that encounters with UCMHs could induce catastrophic events on planets within our solar system, e.g. mass-extinction events on Earth. All these arguments provide compelling reasons to determine what fraction of WIMP DM could be contained in these structures, and what the consequences of its annihilation might be. In this work we studied the inter-relation of the WIMP annihilation cross-section and the maximum fraction of DM found in UCMHs using the multi-frequency consequences of DM annihilation within these objects, as well as constraints that can be further derived upon the primordial power spectrum of perturbations. Finally, we revisit the hypothesis of "volcanogenic" DM inducing mass extinction events on Earth. In so doing we cast doubts on this hypothesis but suggest that it could instead be motivated as a driver of Martian mantle de-gassing that eventually shuts down the geodynamo within the red planet.