Cosmological Relaxation from Dark Fermion Production
  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.
