Constraints on the radiation temperature before inflation

TL;DR

This paper investigates the temperature bounds of radiation at the start of inflation, focusing on the transition period from the Planck era to inflation, to better understand early universe conditions.

Contribution

It provides new constraints on the radiation temperature at the onset of inflation, bridging the gap between the Planck era and inflationary models.

Findings

Established upper and lower temperature limits at inflation start

Refined understanding of early universe thermal conditions

Connected Planck era physics with inflationary onset

Abstract

We consider the short period of cosmic expansion ranging from the end of the Planck era to the beginning of inflation and set upper and lower limits on the temperature of the radiation at the commencement of the inflationary phase.