Natural inflation in 5D warped backgrounds

TL;DR

This paper explores models of cosmic inflation derived from five-dimensional gauge theories with various warped backgrounds, emphasizing how geometrical properties influence the inflaton potential's flatness.

Contribution

It introduces a framework linking 5D geometrical quantities to inflaton potentials, extending inflation models to different warped backgrounds.

Findings

Inflaton potential remains naturally flat due to shift symmetries.

Mass scales are connected to 5D geometrical parameters.

Models are consistent with WMAP five-year data.

Abstract

In light of the five-year data from the Wilkinson Microwave Anisotropy Probe (WMAP), we discuss models of inflation based on the pseudo Nambu-Goldstone potential predicted in five-dimensional gauge theories for different backgrounds: flat Minkowski, anti-de Sitter, and dilatonic spacetime. In this framework, the inflaton potential is naturally flat due to shift symmetries and the mass scales associated with it are related to 5D geometrical quantities.