Journal
PHYSICS LETTERS B
Volume 751, Issue -, Pages 464-468Publisher
ELSEVIER
DOI: 10.1016/j.physletb.2015.11.001
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Funding
- National Science and Engineering Research Council (NSERC) of Canada Discovery Grant
- Perimeter Institute for Theoretical Physics
- Government of Canada through Industry Canada
- Province of Ontario
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In a popular class of models, dark matter comprises an asymmetric population of composite particles with short range interactions arising from a confined nonabelian gauge group. We show that coupling this sector to a well-motivated light mediator particle yields efficient darkleosynthesis, a dark-sector version of big-bang nucleosynthesis (BBN), in generic regions of parameter space. Dark matter self-interaction bounds typically require the confinement scale to be above Lambda(QCD), which generically yields large (>> MeV/dark-nucleon) binding energies. These bounds further suggest the mediator is relatively weakly coupled, so repulsive forces between dark-sector nuclei are much weaker than Coulomb repulsion between standard-model nuclei, which results in an exponential barrier-tunneling enhancement over standard BBN. Thus, darklei are easier to make and harder to break than visible species with comparable mass numbers. This process can efficiently yield a dominant population of states with masses significantly greater than the confinement scale and, in contrast to dark matter that is a fundamental particle, may allow the dominant form of dark matter to have high spin (S >> 3/2), whose discovery would be smoking gun evidence for dark nuclei. (C) 2015 The Authors. Published by Elsevier B.V.
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