Multi-Natural Inflation

Abstract

We propose a multi-natural inflation model in which the single-field inflaton potential consists of two or more sinusoidal potentials that are comparable in size, but have different periodicity with a possible non-zero relative phase. The model is versatile enough to realize both large-field and small-field inflation. We show that, in a model with two sinusoidal potentials, the predicted values of the spectral index and tensor-to-scalar ratio lie within the $1\sigma$ region of the Planck data. In particular, there is no lower bound on the decay constants in contrast to the original natural inflation. We also show that, in a certain limit, multi-natural inflation can be approximated by a hilltop quartic inflation model.

11 pages, 4 figures; updated version: comment on BICEP2 added, matches with published version

References in corpus (14)

• BICEP2 I: Detection Of B-mode Polarization at Degree Angular Scales
• Monodromy in the CMB: Gravity Waves and String Inflation
• New models of chaotic inflation in supergravity
• General inflaton potentials in supergravity
• UV-Protected Inflation
• Running Kinetic Inflation
• Multi-Natural Inflation in Supergravity and BICEP2
• Higgs Chaotic Inflation in Standard Model and NMSSM
• Running Spectral Index from Large-field Inflation with Modulations Revisited
• Higgs Chaotic Inflation and the Primordial B-mode Polarization Discovered by BICEP2
• PeV-scale Supersymmetry from New Inflation
• General Analysis of Inflation in the Jordan frame Supergravity
• Natural inflation at the GUT scale
• Lower Bound on the Garvitino Mass $m_{3/2}>O(100)$ TeV in $R$-Symmetry Breaking New Inflation

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• Natural Inflation: Consistency with Cosmic Microwave Background Observations of Planck and BICEP2
• QCD Axion on Hilltop by a Phase Shift of $\pi$
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• Higgs Chaotic Inflation and the Primordial B-mode Polarization Discovered by BICEP2
• Chromo-Natural Inflation in the Axiverse
• Saving Natural Inflation
• Implications of the Cosmic Birefringence Measurement for the Axion Dark Matter Search
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• Hillclimbing inflation in metric and Palatini formulations
• Challenges for heavy QCD axion inflation
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• Early Dark Energy in Type IIB String Theory
• WIMPflation
• Cosmic Axion Force
• Single field inflation with modulated potential in light of the Planck and BICEP2
• Axion global fits with Peccei-Quinn symmetry breaking before inflation using GAMBIT
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• Relaxing Isocurvature Bounds on String Axion Dark Matter
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• What if ALP dark matter for the XENON1T excess is the inflaton
• Consistent inflationary cosmology from quadratic gravity with dynamical torsion
• Stochastic inflation with an extremely large number of $e$-folds
• Early dark energy by dark Higgs, and axion-induced non-thermal trapping
• Small cosmological constant from a peculiar inflaton potential
• Viable Chaotic Inflation as a Source of Neutrino Masses and Leptogenesis
• Dark Matter in Axion Landscape
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• Flat Direction Inflation with Running Kinetic Term and Baryogenesis
• Small field axion inflation with sub-Planckian decay constant
• The two-field regime of natural inflation
• Power spectrum oscillations from Planck-suppressed operators in effective field theory motivated monodromy inflation
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• Neutrino CP phases from Sneutrino Chaotic Inflation
• Gravitational Wave From Axion-like Particle Inflation
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• Trans-Planckian censorship constraints on properties and cosmological applications of axion-like fields
• Constraints on small-field axion inflation
• Dissipative Emergence of Inflation from Quasi-Cyclic Universe
• Analytic results in aligned axion inflation
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• Flavored axion-monodromy inflation
• Extranatural Inflation Redux
• Tilt and Tensor-to-Scalar Ratio in Multi-Scalar Field Inflation: Non-Sum-Separable Case