Hierarchical Axion Inflation

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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Cited by in corpus (51)

• A Clockwork Axion
• Feebly-Interacting Particles:FIPs 2020 Workshop Report
• The Powers of Monodromy
• Transplanckian axions !?
• Natural Inflation and Quantum Gravity
• A Flux-Scaling Scenario for High-Scale Moduli Stabilization in String Theory
• Cosmological Collider Physics and the Curvaton
• Experimental Targets for Photon Couplings of the QCD Axion
• Tuning and Backreaction in F-term Axion Monodromy Inflation
• Large-Field Inflation with Multiple Axions and the Weak Gravity Conjecture
• Axion Monodromy and the Weak Gravity Conjecture
• D7-Brane Moduli Space in Axion Monodromy and Fluxbrane Inflation
• Can Gravitational Instantons Really Constrain Axion Inflation?
• Planckian Axions in String Theory
• Dynamics of Relaxed Inflation
• Topological Defects and nano-Hz Gravitational Waves in Aligned Axion Models
• Towards Natural Inflation in String Theory
• Domain Wall Formation from Level Crossing in the Axiverse
• Axion monodromy inflation with multi-natural modulations
• Large Field Inflation from Axion Mixing
• Trajectories with suppressed tensor-to-scalar ratio in Aligned Natural Inflation
• Level Crossing between QCD Axion and Axion-Like Particle
• Aligned natural inflation with modulations
• Systematics of Axion Inflation in Calabi-Yau Hypersurfaces
• Natural inflation with and without modulations in type IIB string theory
• D-brane Potentials in the Warped Resolved Conifold and Natural Inflation
• Systematics of type IIB moduli stabilisation with odd axions
• Naturalizing Supersymmetry with a Two-Field Relaxion Mechanism
• Large Field Ranges from Aligned and Misaligned Winding
• Modified Lyth bound and implications of BICEP2 results
• Orientifold Calabi-Yau Threefolds with Divisor Involutions and String Landscape
• Hypercharge Axion and the Diphoton $750$ GeV Resonance
• Chiral primordial blue tensor spectra from the axion-gauge couplings
• Towards natural inflation from weakly coupled heterotic string theory
• Pole N-flation
• Natural Inflation and Low Energy Supersymmetry
• Helical Inflation and Cosmic Strings
• Grand Unification and Subcritical Hybrid Inflation
• Natural Inflation from Near Alignment in Heterotic String Theory
• Generalized Clockwork Theory
• Gravitational Waves from Axion Monodromy
• The Super-Planckian Axion Strikes Back
• Weak Gravity Conjecture From Low Energy Observers' Perspective
• Multi-chaotic inflation with and without spectator field
• Phases of Inflation
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• Hitchhiker's Guide to the Swampland: The Cosmologist's Handbook to the string-theoretical Swampland Programme
• Lensing dispersion of SNIa and small scales of the primordial power spectrum
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• Tilt and Tensor-to-Scalar Ratio in Multi-Scalar Field Inflation: Non-Sum-Separable Case