Inflation 2024

TL;DR

This paper uses current CMB data to set the tightest constraints on inflationary models, exploring their implications for early universe physics and gravitational wave backgrounds.

Contribution

It provides the most stringent observational constraints on inflation parameters using existing CMB data, advancing understanding of early universe conditions.

Findings

Tightest constraints on inflation energy scale

Implications for primordial tensor non-Gaussianity

Limits on inflationary gravitational wave background

Abstract

Inflation as the leading paradigm depicting the very early universe physics could leave imprints on the cosmic microwave background (CMB) radiation. Using currently available CMB observations, we give the tightest constraints on inflation so far. We discuss the theoretical implications of our results including the energy scale of inflation, inflaton field excursion, Hubble expansion rate during inflation, equation of state of inflation, primordial tensor non-Gaussianity, primordial tensor power spectrum, B-mode anisotropy and inflationary gravitational wave background.