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HK: Fachverband Physik der Hadronen und Kerne

HK 48: Heavy-Ion Collisions and QCD Phases XII

HK 48.2: Talk

Wednesday, March 13, 2024, 17:45–18:00, HBR 14: HS 1

QCD topology and axions — Bastian Brandt, Gergely Endrödi, •José Javier Hernández Hernández, Gergely Markó, and Laurin Pannullo — Universität Bielefeld

A possible solution to the strong CP problem is the axion mechanism. Axions are widely studied since they are also candidates for dark matter and they are susceptible to experimental detection, e.g. through their coupling with photons. Moreover, the axion mass is a source of cosmological information during the early universe. Using Lattice QCD simulations with staggered quarks at the physical point, we explore the impact of electromagnetic fields on topological observables related to axions. Our focus is on the topological susceptibility (∝ m_a²) and the axion-photon coupling. The current status in the determination of the magnetic field dependence of the axion mass at finite temperature, with a focus in the crossover region, is shown. We also present the result of the first non-perturbative calculation of the QCD corrections to the axion-photon coupling.

Keywords: Lattice QCD; Axions; Topology