Inflation, quantum fields, and CMB anisotropies

TL;DR

This paper discusses how quantum field renormalization impacts primordial perturbations during inflation, affecting CMB anisotropies, and shows that these effects are consistent with current observations and favor simple inflation models.

Contribution

It introduces the significance of quantum field renormalization in inflationary predictions and demonstrates its compatibility with observational data.

Findings

Quantum field renormalization alters primordial perturbation predictions.

Predictions remain consistent with current CMB observations.

Future gravitational wave observations will test these new predictions.

Abstract

Inflationary cosmology has proved to be the most successful at predicting the properties of the anisotropies observed in the cosmic microwave background (CMB). In this essay we show that quantum field renormalization significantly influences the generation of primordial perturbations and hence the expected measurable imprint of cosmological inflation on the CMB. However, the new predictions remain in agreement with observation, and in fact favor the simplest forms of inflation. In the near future, observations of the influence of gravitational waves from the early universe on the CMB will test our new predictions.