期刊
JOURNAL OF HIGH ENERGY PHYSICS
卷 -, 期 11, 页码 -出版社
SPRINGER
DOI: 10.1007/JHEP11(2018)084
关键词
Beyond Standard Model; Cosmology of Theories beyond the SM
资金
- Department of Energy [DE-SC0011726]
- National Science Foundation [PHY-1607190]
- NSFC [11875112]
- German Research Foundation (DFG) [EXC-1098, KO 4820/1-1, FOR 2239]
- European Research Council (ERC) under the European Union's Horizon 2020 research and innovation programme [637506]
- INT program Multi-Scale Problems Using Effective Field Theories [INT-18-1b]
The small-scale structure problems of the universe can be solved by self-interacting dark matter that becomes strongly interacting at low energy. A particularly predictive model for the self-interactions is resonant short-range interactions with an S-wave scattering length that is much larger than the range. The velocity dependence of the cross section in such a model provides an excellent fit to self-interaction cross sections inferred from dark-matter halos of galaxies and clusters of galaxies if the dark-matter mass is about 19 GeV and the scattering length is about 17 fm. Such a model makes definite predictions for the few-body physics of weakly bound clusters of the dark-matter particles. The formation of the two-body bound cluster is a bottleneck for the formation of larger bound clusters. 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. If the dark-matter mass is 19 GeV and the scattering length is 17 fm, 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). The present fraction can be increased to as large as 10(-3) by relaxing the constraints from small-scale structure and decreasing the mass of the dark matter particle.
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