Dark Matter from freeze-in and its inhomogeneities

Abstract

Abstract We consider generic freeze-in processes for generation of Dark Matter, together with the consequent re-thermalization of the Standard Model fluid. We find that Dark Matter inherits the Standard Model adiabatic inhomogeneities on the cosmological scales probed by current observations, that were super-horizon during freeze-in. Thereby, freeze-in satisfies the bounds on iso-curvature perturbations.

Keywords

• Early Universe Particle Physics
• Particle Nature of Dark Matter
• Models for Dark Matter
• Baryo-and Leptogenesis