Completing natural inflation

Jihn E. Kim, Hans Peter Nilles, Marco Peloso

Research output: Contribution to journalArticlepeer-review

284 Scopus citations

Abstract

If the inflaton is a pseudo-scalar axion, the axion shift symmetry can protect the flatness of its potential from too large radiative corrections. This possibility, known as natural inflation, requires an axion scale which is greater than the (reduced) Planck scale. It is unclear whether such a high value is compatible with an effective field theoretical description, and whether the global axionic symmetry survives quantum gravity effects. We propose a mechanism which provides an effective large axion scale, although the original one is sub-Planckian. The mechanism is based on the presence of two axions, with a potential provided by two anomalous gauge groups. The effective large axion scale is due to an almost exact symmetry between the couplings of the axions to the anomalous groups. We also comment on a possible implementation in heterotic string theory.

Original languageEnglish (US)
Pages (from-to)61-70
Number of pages10
JournalJournal of Cosmology and Astroparticle Physics
Issue number1
DOIs
StatePublished - Jan 2005

Keywords

  • Axions
  • Inflation

Fingerprint Dive into the research topics of 'Completing natural inflation'. Together they form a unique fingerprint.

Cite this