http://arxiv.org/abs/1909.07706
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.
K. Kadota, U. Min, M. Son, et. al.
Wed, 18 Sep 19
10/64
Comments: 40 pages, 7 figures
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