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Title: Production of dark-matter bound states in the early universe by three-body recombination

Journal Article · · Journal of High Energy Physics (Online)
 [1];  [2];  [3]
  1. The Ohio State Univ., Columbus, OH (United States)
  2. Fudan Univ., Shanghai (China)
  3. Johannes Gutenberg Univ., Mainz (Germany)

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.

Research Organization:
The Ohio State Univ., Columbus, OH (United States)
Sponsoring Organization:
USDOE Office of Science (SC), High Energy Physics (HEP); National Science Foundation (NSF); NSFC; German Research Foundation (DFG); European Research Council (ERC)
Grant/Contract Number:
SC0011726; PHY-1607190; 11875112; EXC-1098; KO 4820/1-1; FOR 2239; 637506
OSTI ID:
1602477
Journal Information:
Journal of High Energy Physics (Online), Vol. 2018, Issue 11; ISSN 1029-8479
Publisher:
Springer BerlinCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 24 works
Citation information provided by
Web of Science

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Cited By (11)

Velocity Dependence from Resonant Self-Interacting Dark Matter journal February 2019
Astrophysical probes of inelastic dark matter with a light mediator journal February 2020
Finite-Size Dark Matter and its Effect on Small-Scale Structure text January 2020
Baryon-dark matter coincidence in mirrored unification journal October 2019
Finite-Size Dark Matter and its Effect on Small-Scale Structure journal January 2020
Enhanced n-body annihilation of dark matter and its indirect signatures journal March 2019
Velocity Dependence from Resonant Self-Interacting Dark Matter text January 2018
Velocity Dependence from Resonant Self-Interacting Dark Matter text January 2019
Displaced Lepton Jet Signatures from Self-Interacting Dark Matter Bound States text January 2018
Baryon-Dark Matter Coincidence in Mirrored Unification text January 2019
Astrophysical probes of inelastic dark matter with a light mediator text January 2019

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