Dark Matter and Baryon Asymmetry from the very Dawn of Universe
  We propose a universal mechanism of producing dark matter and baryon (lepton)
charge at the stage of the quasi-de Sitter expansion of the
Universe---inflation. The key ingredient of the mechanism is a linear coupling
of the field, responsible for generation of dark matter or baryon (lepton)
charge, to a function of the inflaton. During inflation this induces almost
constant force dragging the corresponding field to the non-zero value. This
force explicitly breaks quantum numbers associated with dark matter/baryon
abundance at later stages. As a particular realization of the mechanism we
introduce a super-heavy complex scalar field with the mass larger than the
Hubble rate during the last e-folds of inflation. The global U(1)-symmetry is
violated due to the linear coupling of the phase of the complex scalar to the
inflaton. The symmetry breaking leads to the generation of a non-zero Noether
charge. The latter is directly related to the dark matter abundance, or,
alternatively, can be converted into baryon asymmetry, if the complex scalar
carries the baryon charge.
