Topology and axions in QCD
Maria Paola Lombardo, Anton Trunin
Abstract
QCD axions are at the crossroads of QCD topology and Dark Matter searches. We present here the current status of topological studies on the lattice, and their implication on axion physics. We outline the specific challenges posed by lattice topology, the different proposals for handling them, the observable effects of topology on the QCD spectrum and its interrelation with chiral and axial symmetries. We review the transition to the quark–gluon plasma, the fate of topology at the transition, and the approach to the high temperature limit. We discuss the extrapolations needed to reach the regime of cosmological relevance, and the resulting constraints on the QCD axion.
Topics & Concepts
PhysicsAxionQuantum chromodynamicsTopology (electrical circuits)ObservableLattice QCDParticle physicsChiral perturbation theoryLattice (music)QCD matterTheoretical physicsLattice field theoryCurrent (fluid)Dark matterSpectrum (functional analysis)Topological defectDark Matter and Cosmic PhenomenaQuantum Chromodynamics and Particle InteractionsHigh-Energy Particle Collisions Research