Speaker
Dr
Taewook Youn
(Cornell University)
Description
We present a holographic construction of the QCD axion based on a warped 5D model. A key ingredient of our setup is the introduction of a bulk scalar field $\theta$ which is holographically dual to the topological operator of QCD. We identify the bulk modes corresponding to the $\eta'$ and axion states, and show that an adjustment analogous to that of the usual 4D axion takes place.
We trace the origin of the axion quality problem within this framework and demonstrate that its resolution requires significant axion compositeness, a limit where the physical state resides predominantly in the bulk gauge field.