标题： 在银河系的超紧致结构中猎寻暗物质 显示英文标题

标题： Hunting Dark Matter in ultra-compact structures within the Milky-Way

摘要： 当地环境非常适合通过微透镜效应和多频段辐射来寻找紧凑型暗结构，因为这些天体预计会很微弱，而微透镜实验已经暗示了它们存在的可能性。 如果这些天体是由暗物质（DM）组成的，则关于它们丰度的限制较少，但无论它们存在与否，在局部和宇宙尺度上都可能带来许多后果。 在这项工作中，我们研究了早期宇宙中形成的超紧致小晕块（UCMHs）的可能性。 由于这些天体具有较大的中心密度，能够抵御后期潮汐剥离的最严重影响，因此它们可以一直持续到当前时代。 因此，这些天体可以作为早期宇宙物理许多细节的探针，例如原始相变、暴胀、原始密度扰动场的小尺度探索以及这些扰动的非高斯性。 它们也是高度暗物质主导的天体这一事实意味着，它们是在继续通过间接探测寻找暗物质（DM）本质的研究中具有吸引力的对象。 在本地环境中研究这类天体的另一个原因是推测与UCMHs的遭遇可能会在我们的太阳系内引发灾难性事件，例如地球上的大规模物种灭绝。 我们将概述一种针对银河系中Gaia能够准确重建微透镜质量的区域内UCMHs的多频段搜索策略。 这种方法确保任何候选的UCMH DM发射应该与某些可确定质量的未识别微透镜物体相关联，并证明由于UCMHs导致地球大规模火山灭绝的可能性不大，但火星地磁发电机的丧失可能是由与这些紧凑型天体的遭遇驱动的。 显示英文摘要

摘要： The local environment is ideal for searching out compact dark structures via the microlensing and multi-frequency emissions as these objects are expected to be faint and microlensing experiments have already hinted at their possibility. In the case that these objects are composed of Dark Matter (DM) then there are both few limits on their abundance but many consequences of their existence or non-existence on both local and cosmic scales. In this work we examine the possibility of Ultra-Compact Mini-Halos (UCMHs) formed in the early universe. These objects can persist to the present epoch due to their large central density inuring them to the worst effects of later tidal stripping. As such, these objects could constitute probes of many details of early universe physics, such as primordial phase-transitions, inflation, small scale exploration of the primordial density perturbation field and non-Gaussianity of these density perturbations. 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) through indirect detection. Another reason to study such objects in the local environment 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. We will outline a strategy for multi-frequency UCMH searches within the region of the Milky-Way in which Gaia can accurately reconstruct microlens masses. This methodology ensures that any candidate UCMH DM emission should correlate to some unidentified microlensing object with determinable mass and demonstrate that large-scale volcanic extinctions on Earth due to UCMHs are unlikely but that it is possible for loss of the Martian geodynamo to be driven encounters with such compact objects.