On UltraViolet effects in protected inflationary models

TL;DR

This paper investigates the UV sensitivity of inflationary models with protective symmetries, revealing that such models still exhibit significant UV dependence affecting inflation's duration and robustness.

Contribution

It demonstrates that protected inflationary models remain UV-sensitive and analyzes how corrections influence inflation's stability and initial condition dependence.

Findings

UV corrections can significantly alter inflation duration

Protected models are still UV-sensitive

Inflation robustness depends on UV effects

Abstract

Inflationary models are usually UV sensitive. Several mechanism have been proposed to protect the necessary features of the potential, and most notably (softly broken) global symmetries as shift-symmetry. We show that, even in presence of these protecting mechanisms, the models maintain a serious UV-dependence. Via an improved effective theory analysis, we show how these corrections could significantly affect the duration of inflation, its robustness against the choice of initial conditions and the regimes that make it possible.