Journal
EUROPEAN PHYSICAL JOURNAL C
Volume 74, Issue 3, Pages -Publisher
SPRINGER
DOI: 10.1140/epjc/s10052-014-2797-3
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Funding
- Department of Energy [DE-FG02-04ER41286]
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq)
- Division Of Physics
- Direct For Mathematical & Physical Scien [1342611] Funding Source: National Science Foundation
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Recent observations suggest that the number of relativistic degrees of freedom in the early universe might exceed what is predicted in the standard cosmological model. If even a small, percent-level fraction of dark matter particles are produced relativistically, they could mimic the effect of an extra realistic species at matter-radiation equality while obeying BBN, CMB and Structure Formation bounds. We show that this scenario is quite naturally realized with a weak-scale dark matter particle and a high-scale mother particle within a well-motivated 3-3-1 gauge model, which is particularly interesting for being consistent with electroweak precision measurements, with recent LHC results, and for offering a convincing explanation for the number of generations in the Standard Model.
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