Inflection-point inflation and dark matter redux

A bstract We investigate for viable models of inflation that can successfully produce dark matter (DM) from inflaton decay process, satisfying all the constraints Cosmic Microwave Background (CMB) and some other observations. In particular, we analyze near-inflection-point small field inflationary scenario with non-thermal production fermionic DM decaying during reheating era. To this end, propose two different polynomial potential. The potential Model I contains terms proportional to linear, quadratic, quartic in inflaton; whereas II, only even power highest term is sextic inflaton. For both models, find out possible on model parameters which lead proper CMB data a very tensor-to-scalar ratio, as expected small-field model. With allowed parameter space CMB, then search satisfactory relic abundance DM, be produced via reheating, match present-day cold (CDM) density spaces ? mass Yukawa couplings range 10 ? 9 ? y 15 3 GeV ? m GeV. associated inflection-points each maximum temperature reached early universe its production. Finally, coming combined stability analysis SM Higgs decays well BBN Lyman- ? bounds.