Cosmological relaxation from dark fermion production. (English) Zbl 1435.85011
Summary: 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.
MSC:
| 85A40 | Astrophysical cosmology |
| 83C56 | Dark matter and dark energy |
| 81V74 | Fermionic systems in quantum theory |
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