来自太阳和地球的暗物质盘增强中微子通量
Dark Matter Disc Enhanced Neutrino Fluxes from the Sun and Earth
摘要：
当盘星系形成在一个等级宇宙学中时，大质量的合并卫星优先被拖向盘平面。从这些卫星吸积的物质形成了一个暗物质盘，它贡献了太阳位置非旋转晕密度的0.25 - 1.5倍。在这里，我们显示的重要性，暗盘的间接暗物质探测中微子望远镜。先前对地球和太阳中WIMP湮灭产生的中微子通量的预测都假设银河系的暗物质是以高斯速度分布的球形分布，即标准的晕模型。虽然暗盘的局部密度与暗晕相当，但它在低速时的相空间密度更高，大大提高了太阳和地球的捕获率。对于典型的暗盘性质，来自地球的μ子通量比SHM增加了三个数量级，而对于太阳，增加了一个数量级。这大大增加了中微子望远镜在固定或约束WIMP模型参数时的灵敏度。来自地球的通量对暗盘的详细特性非常敏感，而来自太阳的通量则更加强大。来自暗盘的μ子通量的增强使得在地球中寻找WIMP湮灭的水平与在太阳中寻找WIMP质量< 100 GeV的水平相同。
英文摘要：
As disc galaxies form in a hierarchical cosmology, massive merging satellites are preferentially dragged towards the disc plane. The material accreted from these satellites forms a dark matter disc that contributes 0.25 - 1.5 times the non-rotating halo density at the solar position. Here, we show the importance of the dark disc for indirect dark matter detection in neutrino telescopes. Previous predictions of the neutrino flux from WIMP annihilation in the Earth and the Sun have assumed that Galactic dark matter is spherically distributed with a Gaussian velocity distribution, the standard halo model. Although the dark disc has a local density comparable to the dark halo, its higher phase space density at low velocities greatly enhances capture rates in the Sun and Earth. For typical dark disc properties, the resulting muon flux from the Earth is increased by three orders of magnitude over the SHM, while for the Sun the increase is an order of magnitude. This significantly increases the sensitivity of neutrino telescopes to fix or constrain parameters in WIMP models. The flux from the Earth is extremely sensitive to the detailed properties of the dark disc, while the flux from the Sun is more robust. The enhancement of the muon flux from the dark disc puts the search for WIMP annihilation in the Earth on the same level as the Sun for WIMP masses < 100 GeV.
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