Abstract
In this work we study a classically scale invariant extension of the Standard Model that can explain simultaneously dark matter and the baryon asymmetry in the universe. In our set-up we introduce a dark sector, namely a non-Abelian SU(2) hidden sector coupled to the SM via the Higgs portal, and a singlet sector responsible for generating Majorana masses for three right-handed sterile neutrinos. The gauge bosons of the dark sector are mass-degenerate and stable, and this makes them suitable as dark matter candidates. Our model also accounts for the matter-anti-matter asymmetry. The lepton flavour asymmetry is produced during CP-violating oscillations of the GeV-scale right-handed neutrinos, and converted to the baryon asymmetry by the electroweak sphalerons. All the characteristic scales in the model: the electro-weak, dark matter and the leptogenesis/neutrino mass scales, are generated radiatively, have a common origin and related to each other via scalar field couplings in perturbation theory.
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ArXiv ePrint: 1605.06834
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Khoze, V.V., Plascencia, A.D. Dark matter and leptogenesis linked by classical scale invariance. J. High Energ. Phys. 2016, 25 (2016). https://doi.org/10.1007/JHEP11(2016)025
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DOI: https://doi.org/10.1007/JHEP11(2016)025
Keywords
- Beyond Standard Model
- Cosmology of Theories beyond the SM
- Spontaneous Symmetry Breaking