Multi-Natural Inflation in Supergravity

Abstract

We show that the recently proposed multi-natural inflation can be realized within the framework of 4D $\mathcal{N}=1$ supergravity. The inflaton potential mainly consists of two sinusoidal potentials that are comparable in size, but have different periodicity with a possible non-zero relative phase. For a sub-Planckian decay constant, the multi-natural inflation model is reduced to axion hilltop inflation. We show that, taking into account the effect of the relative phase, the spectral index can be increased to give a better fit to the Planck results, with respect to the hilltop quartic inflation. We also consider a possible UV completion based on a string-inspired model. Interestingly, the Hubble parameter during inflation is necessarily smaller than the gravitino mass, avoiding possible moduli destabilization. Reheating processes as well as non-thermal leptogenesis are also discussed.

31 pages, 6 figures. v2: version published in JHEP, references added, title changed

References in corpus (17)

• Four-dimensional String Compactifications with D-Branes, Orientifolds and Fluxes
• Flux Compactification
• Spacetime Instanton Corrections in 4D String Vacua - The Seesaw Mechanism for D-Brane Models
• A Natural Framework for Chaotic Inflation
• Neutrino Majorana Masses from String Theory Instanton Effects
• New models of chaotic inflation in supergravity
• An Ignoble Approach to Large Field Inflation
• De Sitter Vacua from Matter Superpotentials
• SUSY Breaking in Local String/F-Theory Models
• O'KKLT
• Running Kinetic Inflation
• UV-Protected Inflation
• Gravitational Gauge Mediation
• The 7 keV axion dark matter and the X-ray line signal
• Higgs Chaotic Inflation in Standard Model and NMSSM
• General Analysis of Inflation in the Jordan frame Supergravity
• PeV-scale Supersymmetry from New Inflation

Cited by in corpus (15)

• Aligned Natural Inflation in String Theory
• Natural and Multi-Natural Inflation in Axion Landscape
• Natural Inflation: Consistency with Cosmic Microwave Background Observations of Planck and BICEP2
• Axion Landscape and Natural Inflation
• Axion monodromy inflation with multi-natural modulations
• Natural inflation with and without modulations in type IIB string theory
• Single field inflation with modulated potential in light of the Planck and BICEP2
• X-ray Line from the Dark Transition Electric Dipole
• Relaxing Isocurvature Bounds on String Axion Dark Matter
• Natural Inflation and Low Energy Supersymmetry
• Chaotic Inflation in No-Scale Supergravity with String Inspired Moduli Stabilization
• Spinodal Instabilities and Super-Planckian Excursions in Natural Inflation
• Illustrating SUSY breaking effects on various inflation mechanisms
• Flat Direction Inflation with Running Kinetic Term and Baryogenesis
• R-symmetric Axion/Natural Inflation in Supergravity via Deformed Moduli Dynamics