Hierarchical Axion Inflation
arXiv:1404.7773 · doi:10.1103/PhysRevLett.113.261301
Abstract
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 non-perturbative 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.
REVTeX, 5 pages, 2 figures, added refs, changed the numerical parameter values of the stringy example, removed ED1's from the superpotential
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- Helical Inflation and Cosmic Strings
- Grand Unification and Subcritical Hybrid Inflation
- Natural Inflation from Near Alignment in Heterotic String Theory
- Gravitational Waves from Axion Monodromy
- Large Field Inflation Models from Higher-Dimensional Gauge Theories
- Signatures of Planck Corrections in a Spiralling Axion Inflation Model
- Lensing dispersion of SNIa and small scales of the primordial power spectrum