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Scalar fields provide attractive modifications of pre-BBN cosmology, whichhave interesting implications for dark matter abundances. We analyse the effectof these modifications on the number of e-foldings between horizon exit of CMBmodes and the end of inflation $(N_k)$, and examine the consequences forinflationary predictions of various models. We find significant effects in thepredictions in the $(n_s, r)$ plane. For a large part of the parameter space,the shift in $N_k$ is positive; this ameliorates the tension of $m^{2}\varphi^{2}$ and natural inflation with data.

Post-inflationary Scalar Tensor Cosmology and Inflationary Parameters