Axionlike Origin of the Primordial Density Perturbation

Abstract

We show that an axionlike field coupled to a new confining gauge group can generate the primordial density perturbation in the post-inflation universe. The axion decay constant and strong coupling scale are uniquely determined by observations of the density perturbation, which further suggest a temporal deconfinement of the gauge group after inflation. The resulting temperature-dependent axion potential, together with its periodic nature, gives rise to the red-tilted density perturbation, with a positive local-type non-Gaussianity of order unity.

7 pages, 1 figure, v2: published in PRL

References in corpus (4)

• Flux Compactification
• Planck 2018 results. IX. Constraints on primordial non-Gaussianity
• Non-Gaussianity from Axionic Curvaton
• The 21-cm signals from ultracompact minihalos as a probe of primordial small-scale fluctuations

Cited by in corpus (4)

• Growth of curvature perturbations for PBH formation \& detectable GWs in non-minimal curvaton scenario revisited
• Cosmic Perturbations from a Rotating Field
• Primordial non-Gaussianity as a probe of seesaw and leptogenesis
• Unified Origin of Curvature Perturbation and Baryon Asymmetry of the Universe