Spontaneous Cogensis by QCD axion in Type I Seesaw

TL;DR

This paper introduces a unified axion-driven cogenesis model linking baryon asymmetry and dark matter, utilizing kinetic misalignment within a PQ and Type-I seesaw framework, compatible with current constraints.

Contribution

It presents a novel mechanism for axion cogenesis via kinetic misalignment, integrating PQ symmetry with heavy neutrinos and identifying viable parameter spaces.

Findings

Identifies parameter ranges for right-handed neutrino masses and Hubble scales for successful cogenesis.

Demonstrates robustness of kinetic axion misalignment as a mechanism independent of inflationary details.

Ensures compatibility with the strong CP problem and axion isocurvature constraints.

Abstract

We propose a generic axion--driven cogenesis scenario in which both the baryon asymmetry and dark matter abundance originate from the kinetic misalignment. The framework unifies the Peccei--Quinn (PQ) mechanism with a Type--I seesaw sector, where Hubble--induced masses and higher-dimensional PQ--violating operators drive early--time axion rotation. Working within the DFSZ axion model augmented by heavy neutrinos, we identify the parametric window of right-handed neutrino masses, determined by its decay rate, and the range of Hubble scales compatible with successful cogenesis, while maintaining the axion solution to the strong CP problem and satisfying current limits on axion isocurvature perturbations. Our results establish kinetic axion misalignment as a robust and predictive mechanism for axion cogenesis, independent of the inflationary microphysics.