Post-inflationary Scalar Tensor Cosmology and Inflationary Parameters

Abstract

Scalar fields provide attractive modifications of pre-BBN cosmology, which have interesting implications for dark matter abundances. We analyse the effect of these modifications on the number of e-foldings between horizon exit of CMB modes and the end of inflation $(N_k)$, and examine the consequences for inflationary predictions of various models. We find significant effects in the predictions 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 $m^2{\phi }^2$ and natural inflation with data.

19 pages, 2 figures. References added, minor changes. Version to appear in PRD

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• On Inflationary Scale, Reheating Scale and Pre-BBN Cosmology with Scalar Fields
• Trans-Planckian Censorship Conjecture and Non-thermal post-inflationary history
• Fat Inflatons, Large Turns and the $\eta$-problem
• Constraining Non-thermal Dark Matter by CMB
• Sharp turns in axion monodromy: primordial black holes and gravitational waves
• Introduction to the number of $e$-folds in slow-roll inflation
• Finite temperature effects in modular cosmology
• Reheating constraints to modulus mass for single field inflationary models
• Minimal Leptogenesis in Brane-inspired Cosmology
• Inflationary gravitational waves and exotic pre Big Bang Nucleosynthesis cosmology