arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2004.01621hep-phastro-ph.CO
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在实验室中测量局域暗物质密度

Measuring the local Dark Matter density in the laboratory

Bradley J. Kavanagh, Timon Emken, Riccardo Catena

摘要:

尽管有强有力的证据表明我们的宇宙中存在大量的暗物质(DM),但没有直接的迹象表明它存在于我们自己的太阳系中。所有对局部DM密度的估计都依赖于更大尺度上的外推结果。我们证明了第一次的可能性,同时测量本地DM密度和相互作用的横截面与直接检测实验。它依赖于这样的假设,即入射DM粒子在检测之前经常散射在地球核上,从而引起信号的额外时间依赖性。我们表明,亚GeV DM,与大的自旋无关的DM质子截面,未来的直接检测实验应该能够重建本地DM密度小于50%的不确定性。

英文摘要:

Despite strong evidence for the existence of large amounts of dark matter (DM) in our Universe, there is no direct indication of its presence in our own solar system. All estimates of the local DM density rely on extrapolating results on much larger scales. We demonstrate for the first time the possibility of simultaneously measuring the local DM density and interaction cross-section with a direct detection experiment. It relies on the assumption that incoming DM particles frequently scatter on terrestrial nuclei prior to detection, inducing an additional time-dependence of the signal. We show that for sub-GeV DM, with a large spin-independent DM-proton cross section, future direct detection experiments should be able to reconstruct the local DM density with smaller than 50% uncertainty.

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