Compactification driven Hilltop Inflation in Einstein-Yang-Mills

TL;DR

This paper develops a four-dimensional hilltop inflation model derived from higher-dimensional Einstein-Yang-Mills theory with a compact sphere, demonstrating dynamic stabilization of the inflaton or compactification scale during inflation.

Contribution

It introduces a novel inflationary scenario from Einstein-Yang-Mills theory with compactification, showing dynamic stabilization of key parameters during inflation.

Findings

Model compatible with recent CMB data

Inflaton field and compact sphere size are dynamically stabilized

Provides a new link between higher-dimensional theories and inflation

Abstract

Starting from Einstein-Yang-Mills in higher dimensions with an instanton on a compact sphere, we dimensionally reduce to find an effective four-dimensional action describing "hilltop" inflation. Using recent CMB data, we analyse the parameter space of this model to search for viable set-ups. One unique feature of this class of inflationary models is that the value of the inflaton field, or alternatively, the size of the compact sphere, is stabilised dynamically during the inflationary process.