Breaking the degeneracy of non-canonical quartic inflation by reheating considerations

Here, the quartic inflationary potential [Formula: see text] within a non-canonical framework characterized by a power-law Lagrangian is investigated. We demonstrate that the predictions of this model align with the Planck 2018 observational data. We explore how the predictions of the model depend on the non-canonical parameter [Formula: see text] and the number of [Formula: see text]-folds [Formula: see text]. Notably, the sound speed, non-Gaussianity parameter, scalar spectral index, and tensor-to-scalar ratio are all affected by variations in [Formula: see text]. However, the scalar spectral index exhibits a degeneracy with respect to variation in [Formula: see text], which can be broken by incorporating reheating consideration. By applying a combination of theoretical and observational constraints on [Formula: see text], non-Gaussianity, and reheating parameters, we find that the duration of inflation is constrained to the range [Formula: see text] [Formula: see text]-folds for [Formula: see text]. Finally, we investigate relic gravitational waves and demonstrate that their energy density spectrum falls within the sensitivity range of gravitational waves detectors for this constrained range of [Formula: see text]-folds.