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We study the polynomial chaotic inflation model with a single scalar field ina double well quartic potential which has recently been shown to be consistentwith Planck data. In particular, we study the effects of lifting the degeneracybetween the two vacua on the inflationary observables, i.e. spectral index n_sand tensor-to-scalar perturbation ratio r_T. We find that removing thedegeneracy allows the model to satisfy the upper limit constraints on r_T fromPlanck data, provided the field starts near the local maximum. We alsocalculate the scalar power spectrum and non-Gaussianity parameter f_NL for theprimordial scalar perturbations in this model.

Reanalyzing the upper limit on the tensor-to-scalar perturbation ratio r_T in a quartic potential inflationary model