Speaker
Chang Hyeon Lee
(Chungnam National University)
Description
Axions provide a compelling solution to the strong CP problem and a viable candidate for dark matter. We explore their realization in a minimal five-dimensional $M_4 \times S^1/\mathbb{Z}_2$ orbifold framework. An explicit one-loop Casimir energy calculation reveals that the irreducible axion potential induced by worldline instantons is exponentially suppressed, thereby ensuring a high-quality Peccei–Quinn (PQ) symmetry. We further investigate how warped geometry, $\mathbb{Z}_2$-odd gauge couplings, and fixed-point interactions influence the PQ symmetry quality and determine the hierarchy of the axion decay constant.
Primary author
Chang Hyeon Lee
(Chungnam National University)
