New perspectives on axion misalignment mechanism
Chia-Feng Chang, Yanou Cui
Abstract
A zero initial velocity of the axion field is assumed in the conventional misalignment mechanism. We propose an alternative scenario where the initial velocity is nonzero, which may arise from an explicit breaking of the Peccei-Quinn (PQ) symmetry in the early Universe. We demonstrate that, depending on the specifics of the initial velocity and the time order of the PQ symmetry breaking vs inflation, this new scenario can either enhance or suppress the axion relic abundance relative to the conventional prediction. As a result, new viable parameter regions for axion dark matter may open up.
Topics & Concepts
AxionPhysicsSymmetry breakingMechanism (biology)Inflation (cosmology)Dark matterSymmetry (geometry)Particle physicsUniverseField (mathematics)Spontaneous symmetry breakingZero (linguistics)Theoretical physicsAstrophysicsQuantum mechanicsMathematicsGeometryLinguisticsPure mathematicsPhilosophyDark Matter and Cosmic PhenomenaParticle physics theoretical and experimental studiesCosmology and Gravitation Theories