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arXiv 2007.11016hep-phastro-ph.EPhep-ex
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原始太阳暗物质晕的直接探测特征

Direct detection signatures of a primordial Solar dark matter halo

Noah B. Anderson, Angelina Partenheimer, Timothy D. Wiser

摘要:

一小部分暗物质被引力束缚在原太阳的气体云上,可以被压缩到穿越地球的轨道上,其局部密度相当于(甚至超过)星系晕的密度。我们发现,相当一部分(约25%)的“日晕”将保留到今天,在木星的扰动和与地球的近距离接触中幸存下来,并可能在直接探测实验中被观察到。星群会有独特的特征,包括非标准的年度调制和与星系晕相比极低的速度色散,使其成为超轻粒子(如轴子或暗光子)的相干或共振探测的特别有趣的目标。

英文摘要:

A small admixture of dark matter gravitationally bound to the proto-Solar gas cloud could be adiabatically contracted into Earth-crossing orbits with a local density comparable to (or even exceeding) the Galactic halo density. We show that a significant fraction (~25%) of the resulting 'Solar halo' would remain today, surviving perturbations from Jupiter and close encounters with Earth, and would be potentially observable in direct detection experiments. The population would have distinct signatures, including a nonstandard annual modulation and extremely low velocity dispersion compared with the Galactic halo, making it an especially interesting target for coherent or resonant detection of ultralight particles such as axions or dark photons.

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