arXiv 1905.045582019-05-11hep-ph

从三体简化理论研究暗物质束缚态

Dark Matter Bound States from Three-Body Recombination

Eric Braaten, Daekyoung Kang, Ranjan Laha

备注：: 5 pages, 3 figures, presented at 22nd International Conference on Few-Body Problems in Physics in July 2018 in Caen, France

摘要：

宇宙的小尺度结构问题可以通过自相互作用的暗物质来解决，这种暗物质在低能量下会变得相互作用很强。一个特别的预测模型是共振短程自相互作用，暗物质质量约为19 GeV，S波散射长度约为17 fm。这样一个模型对弱束缚暗物质粒子团的少体物理学做出了明确的预言。在假设暗物质粒子为全同玻色子的条件下，计算了早期宇宙中三体复合产生二体束缚团簇的过程，这是形成较大团簇的最有利条件.当暗物质的温度降到结合能以下时，以两体结合团簇形式存在的暗物质的比例可以增加4个数量级，但其目前的数值仍然小于10^（-6）。

英文摘要：

The small-scale structure problems of the universe can be solved by self-interacting dark matter that becomes strongly interacting at low energies. A particularly predictive model is resonant short-range self-interactions, with a dark-matter mass of about 19 GeV and a large S-wave scattering length of about 17 fm. Such a model makes definite predictions for the few-body physics of weakly bound clusters of the dark-matter particles. We calculate the production of two-body bound clusters by three-body recombination in the early universe under the assumption that the dark matter particles are identical bosons, which is the most favorable case for forming larger clusters. The fraction of dark matter in the form of two-body bound clusters can increase by as much as 4 orders of magnitude when the dark-matter temperature falls below the binding energy, but its present value remains less than 10^(-6).

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