Inflation Story: slow-roll and beyond
Dhiraj Kumar Hazra, Daniela Paoletti, Ivan Debono, Arman Shafieloo,, George F. Smoot, Alexei A. Starobinsky

TL;DR
This paper analyzes Planck 2018 CMB data to constrain inflationary models, exploring slow-roll dynamics, potential features, and their statistical significance, including suppression and oscillatory features in the primordial power spectrum.
Contribution
It introduces new inflationary potentials with features and compares their Bayesian evidence against baseline models using updated Planck data and likelihoods.
Findings
Marginal preference for large-scale power suppression in temperature data
Feature models are less favored than baseline slow-roll potentials
Sharp features' significance has decreased with updated data analysis pipeline
Abstract
We present constraints on inflationary dynamics and features in the primordial power spectrum of scalar perturbations using the Cosmic Microwave Background temperature, polarization data from Planck 2018 data release and updated likelihoods. We constrain the slow-roll dynamics using Hilltop Quartic Potential and Starobinsky model in the Einstein frame using the Planck 2018 binned Plik likelihood. Using the Hilltop as base potential we construct Whipped Inflation potential to introduce suppression in the scalar power spectrum at large angular scales. We notice marginal (68% C.L.) preference of suppression from the large scale temperature angular power spectrum. However, large-scale E-mode likelihood, based on high frequency instrument cross spectrum, does not support this suppression and in the combined data the preference towards the suppression becomes negligible. Based on the…
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