Natural Inflation with non minimal coupling to gravity in $R^2$ gravity under the Palatini formalism

M. AlHallak, N. Chamoun, M. S. Eldaher

Natural Inflation with non-minimal coupling (NMC) to gravity, embodied by a Lagrangian term $\xi {\varphi }^{2}R$, is investigated in the context of an extended gravity of the form $R+\alpha R^2$.…