Extra-dimensional axion patterns

De Giorgi, Arturo; Ramos, Maria

Abstract

We study the complete parameter space of a bulk axion in flat and warped extra spacetime dimensions. We characterize in detail the regimes where no single KK mode is produced along the canonical QCD axion line, and instead, it is maximally deviated along with several other axions that constitute a multiple solution to the strong CP problem. In both flat and Randall-Sundrum scenarios, and assuming that all Peccei-Quinn breaking comes from QCD, we find that these solutions are however subject to tight phenomenological constraints. In light of these results, we expect that only KK canonical patterns (with the zero-mode close to the standard QCD line) can emerge from a bulk axion in one or more extra spacetime dimensions. As a byproduct, we generalize the axions eigenvalue and eigenvector equations for an arbitrary number of spacetime dimensions and compactifications.

Citation

De Giorgi, A., & Ramos, M. (2025). Extra-dimensional axion patterns. Physical Review D, 111(7), Article 075006. https://doi.org/10.1103/PhysRevD.111.075006

• Journal Article Type: Article
• Acceptance Date: Mar 10, 2025
• Online Publication Date: Apr 8, 2025
• Publication Date: Apr 1, 2025
• Deposit Date: May 29, 2025
• Publicly Available Date: May 29, 2025
• Journal: Physical Review D
• Print ISSN: 2470-0010
• Electronic ISSN: 2470-0029
• Publisher: American Physical Society
• Peer Reviewed: Peer Reviewed
• Volume: 111
• Issue: 7
• Article Number: 075006
• DOI: https://doi.org/10.1103/PhysRevD.111.075006
• Public URL: https://durham-repository.worktribe.com/output/3967059