Polynomial inflation and dark matter

We present a minimal UV complete framework to embed inflation and dark matter by extending the standard model with a singlet real scalar field (the inflaton) and a singlet fermionic field acting as dark matter. The inflaton features the most general renormalizable polynomial up to quartic order, which is flat due to the existence of a perturbed inflection-point, comfortably fitting CMB measurements. We also analyze (p)reheating by considering the Higgs production via inflaton decay. In the early universe, dark matter can be generated by the mediation of gravitons or inflatons. However, the production via the direct decay of the inflatons dominates, making viable a large range of dark matter masses, from O(10(-5)) GeV to O(10(11)) GeV.

Automated summary

A minimal UV complete framework is proposed to embed inflation and dark matter by adding a singlet real scalar field and a singlet fermionic field to the standard model. The study analyzes the polynomial form of the inflaton and the generation mechanisms of dark matter, demonstrating that the direct decay of inflatons is the dominant mechanism for producing dark matter.