Baryogenesis and Dark Matter from Freeze-In
  We propose a simple model in which the baryon asymmetry and dark matter are
created via the decays and inverse decays of QCD-triplet scalars, at least one
of which must be in the TeV mass range. Singlet fermions produced in these
decays constitute the dark matter. The singlets never reach equilibrium, and
their coherent production, propagation, and annihilation generates a baryon
asymmetry. We find that that the out-of-equilibrium condition and the dark
matter density constraint typically require the lightest scalar to be
long-lived, giving good prospects for detection or exclusion in current and
upcoming colliders. In generalizing the leptogenesis mechanism of Akhmedov,
Rubakov and Smirnov, our model expands the phenomenological possibilities for
low-scale baryogenesis.
