Abstract
We consider the cosmological relaxation solution to the electroweak hierarchy problem using the fermion production as a dominant friction force. In our approach, neither super-Planckian field excursions nor a large number of e-folds arise, and scanning over thermal Higgs mass squared is avoided. The produced fermions from the relaxion source through the derivative coupling are SM-singlets, what we call dark fermions, and they can serve as the keV scale warm dark matter candidates.
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Kadota, K., Min, U., Son, M. et al. Cosmological relaxation from dark fermion production. J. High Energ. Phys. 2020, 135 (2020). https://doi.org/10.1007/JHEP02(2020)135
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DOI: https://doi.org/10.1007/JHEP02(2020)135