Hierarchical axion inflation

Ido Ben-Dayan, Francisco Gil Pedro, Alexander Westphal

Research output: Contribution to journalArticlepeer-review

47 Scopus citations


We propose a new field theory mechanism for generating an effective trans-Planckian decay constant from sub-Planckian ones. Using the minimal two axions and a hierarchy between two axion decay constants is sufficient for realizing inflation through nonperturbative effects only and with minimal tuning. The inflationary motion is kept entirely within a sub-Planckian domain. We outline possible strategies of embedding the model in a string theory setup.

Original languageEnglish
Article number261301
JournalPhysical Review Letters
Issue number26
StatePublished - 23 Dec 2014
Externally publishedYes


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