"On the structure of interactions in holographic QCD"

We investigate the interactions among the pion, vector mesons and external gauge fields in the holographic dual of massless QCD proposed in our previous paper, hep-th/0412144, on the basis of probe D8-branes embedded in a D4-brane background in type IIA string theory. We obtain the coupling constants by performing both analytic and numerical calculations, and compare them with experimental data. One of the highlights is the derivation of vector meson dominance in the pion form factor as well as in the Wess-Zumino-Witten term. Ref) hep-th/0412144, hep-th/0507073 : works done in collaboration with T. Sakai.