Level crossing between the QCD axion and an axionlike particle

2015/10/22 by Ryuji Daido, Naoya Kitajima, Fuminobu Takahashi · 2 citations
Physics and Astronomy · #Axion #Biology #Cosmology and Gravitation Theories #Dark Matter and Cosmic Phenomena #Dark matter #Ecology #Particle (ecology) #Particle physics #Particle physics theoretical and experimental studies #Physics #Quantum chromodynamics #astro-ph.CO #hep-ph #hep-th

paper · pdf · doi:10.1103/physrevd.93.075027

published as Phys. Rev. D 93, 075027 (2016) · 20 pages, 5 figures

arxiv created 2015/10/22 · openalex publication_date 2016/04/19 · arxiv updated 2016/04/27 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

Abstract

We study a level crossing between the QCD axion and an axionlike particle, focusing on the recently found phenomenon, the axion roulette, where the axionlike particle runs along the potential, passing through many crests and troughs, until it gets trapped in one of the potential minima. We perform detailed numerical calculations to determine the parameter space where the axion roulette takes place, and as a result domain walls are likely formed. The domain wall network without cosmic strings is practically stable, and it is nothing but a cosmological disaster. In a certain case, one can make domain walls unstable and decay quickly by introducing an energy bias without spoiling the Peccei-Quinn solution to the strong charge parity problem.

Citations

• Resonant conversions of QCD axions into hidden axions and suppressed isocurvature perturbations
• An improved limit on the axion–photon coupling from the CAST experiment
• Axion dark matter from topological defects
• Cosmology and broken discrete symmetry
• An Improved Experimental Limit on the Electric Dipole Moment of the Neutron

Cited by

• Decay rate of PQ-ball
• Axion Mixing in the String Axiverse