Spectral Distortions from Axion Monodromy Inflation

Abstract

With the advent of new missions to probe spectral distortions of the cosmic microwave background with unprecedented precision, the study of theoretical predictions of these signals becomes a promising avenue to test our description of the early Universe. Meanwhile, axion monodromy still offers a viable framework to describe cosmic inflation. In order to explore new constraints on inflationary models based on axion monodromy while aiming at falsifying this scenario, we compute the spectral distortions predicted by this model, revealing oscillatory features that are compatible with Planck data. Further, the predicted distortions are up to 10% larger than the signals obtained from the fiducial LCDM model and are observable in principle. However, contrasting with the predictions of the simplest power-law inflationary potentials challenges the falsifiability of axion monodromy as it would require to reduce at least 100 times the current forecast error of the PIXIE satellite, which shall be possible at some projected observational setups.

15 pages + citations, 6 figures, 4 tables; v2: fig 2 updated, references added, matches published version

References in corpus (15)

• BICEP / Keck XIII: Improved Constraints on Primordial Gravitational Waves using Planck, WMAP, and BICEP/Keck Observations through the 2018 Observing Season
• Monodromy in the CMB: Gravity Waves and String Inflation
• CMB-S4 Science Case, Reference Design, and Project Plan
• A Natural Framework for Chaotic Inflation
• The Powers of Monodromy
• Lines in the Cosmic Microwave Background Spectrum from the Epoch of Cosmological Hydrogen Recombination
• The synergy between CMB spectral distortions and anisotropies
• Oscillations in the inflaton potential?
• Inflation: Theory and Observations
• Creation of the CMB spectrum: precise analytic solutions for the blackbody photosphere
• TRIS II: search for CMB spectral distortions at 0.60, 0.82 and 2.5 GHz
• Natural Inflation After Planck 2018
• Using CMB spectral distortions to distinguish between dark matter solutions to the small-scale crisis
• Improved upper limit on degree-scale CMB B-mode polarization power from the 670 square-degree POLARBEAR survey
• Sharp turns in axion monodromy: primordial black holes and gravitational waves

Cited by in corpus (3)

• Spectral Distortion Signatures of Step-like Inflationary Potential
• Spectral distortions in the decaying QCD dark matter scenario
• Primordial magnetic non-Gaussianity with generic vacua and detection prospects in CMB spectral distortions