Baryogenesis with Higher Dimension Operators

Understand

We propose a simple model of baryogenesis comprised of the standard model coupled to a singlet X via higher dimension operators O.

• In the early universe, X is thermalized by O mediated scattering processes before it decouples relativistically and evolves into a sizable fraction of the total energy density.
• Eventually, X decays via O in an out of equilibrium, baryon number and CP violating process that releases entropy and achieves baryogenesis for a broad range of parameters.
• The decay can also produce a primordial abundance of dark matter.