2020/05/18 by Maria Paola Lombardo, Anton Trunin · 4 citations
Physics and Astronomy · #Dark Matter and Cosmic Phenomena #High-Energy Particle Collisions Research #Quantum Chromodynamics and Particle Interactions #hep-lat #hep-ph
paper · pdf · doi:10.1142/s0217751x20300100
34 pages, 10 figures; references added, few typos fixed
arxiv created 2020/05/18 · arxiv updated 2020/08/26
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.