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In this work we investigate the inflationary era in the presence of acanonical scalar field and Chern-Simons parity violating corrections. It wasalso assumed that a non minimal coupling between curvature and the scalar fieldis present. For the shake of completeness, the slow-roll and the constant-rollscenarios were examined separately. In the context of this scalar-tensortheory, inflation can be viable for both scenarios since the observationalindices take acceptable values according to the most recent Planck data.Furthermore, the involvement of the Chern-Simons term has no effect on thebackground equations, in contrast to the scalar function which couples with theRicci scalar and participates in the equations of motion. However, theChern-Simons term ensures the chirality of stochastic gravitational waves. Ablue-tilted tensor spectral index of primordial curvature perturbations can bemanifested since, tensor modes are strongly affected by the Chern-Simons term.Lastly, the Swampland criteria and the Lyth-bound were examined in order todistinguish the effective field theories towards the path of a consistentM-theory.

Inflationary phenomenology of non-minimally coupled Einstein-Chern-Simons gravity