The holographic QCD axion

• Main Authors: Francesco Bigazzi, Alessio Caddeo, Aldo L. Cotrone, Paolo Di Vecchia, Andrea Marzolla
• Format: Article
• Language: English
• Published: SpringerOpen 2019-12-01
• Series: Journal of High Energy Physics
• Subjects: AdS-CFT Correspondence; Gauge-gravity correspondence; Chiral Lagrangians; Cosmology of Theories beyond the SM
• Online Access: https://doi.org/10.1007/JHEP12(2019)056

Abstract A holographic model of QCD axion is presented. It describes a composite axion in the KSVZ class. Having a gravity dual, based on the Witten-Sakai-Sugimoto model, it is calculable in the strongly coupled regime. Its basic properties are derived, including the low energy Lagrangian, from which the axion couplings to nucleons can be derived. Basic features in the deconfined phase are studied as well. In particular, the temperature dependence of the axion mass is extracted from the topological susceptibility. As an aside, the topological susceptibility of strongly coupled N $$ \mathcal{N} $$ = 4 SYM at finite temperature is derived for the first time.