Preheating and Entropy Perturbations in Axion Monodromy Inflation

Abstract

We study the preheating of gauge fields in a simple axion monodromy model and compute the induced entropy perturbations and their effect on the curvature fluctuations. We find that the correction to the spectrum of curvature perturbations has a blue spectrum with index $n_s=5/2$. Hence, these induced modes are harmless for the observed structure of the universe. Since the spectrum is blue, there is the danger of overproduction of primordial black holes. However, we show that the observational constraints are easily satisfied.

14 pages, published version

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• Chiral Gravitational Waves and Baryon Superfluid Dark Matter
• Stable solutions of inflation driven by vector fields
• Nonlinear perturbations from axion-gauge fields dynamics during inflation
• Implications of Gravitational-wave Production from Dark Photon Resonance to Pulsar-timing Observations and Effective Number of Relativistic Species
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• Gravitational Waves from Axion Monodromy
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• Note on Reheating in G-inflation
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• Preheating in an Asymptotically Safe Quantum Field Theory
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• Reheating and Entropy Perturbations in Fibre Inflation
• Nonminimal Couplings and the Forgotten Field of Axion Inflation
• On Adiabatic Renormalization with a Physically Motivated Infrared Cut-Off