Strengthening the TCC Bound on Inflationary Cosmology

TL;DR

This paper refines the constraints on inflationary cosmology derived from the Trans-Planckian Censorship Conjecture, suggesting a lower inflation energy scale if the pre-inflationary universe was radiation-dominated, making it potentially testable in experiments.

Contribution

It provides a strengthened bound on the inflationary energy scale under specific pre-inflationary conditions, linking cosmological theory with experimental accessibility.

Findings

Upper bound on inflation energy scale is ~10^4 GeV.

Pre-inflationary radiation domination tightens TCC constraints.

Potential for experimental testing of inflation models.

Abstract

We show that the constraints which follow from the {\it Trans-Planckian Censorship Conjecture} for inflationary cosmology can be strengthened if the pre-inflationary universe was dominated by radiation. The resulting upper bound on the energy scale of inflation is $\eta \sim 10^4 {\rm GeV}$, close to the scale accessible to accelerator experiments.