Dynamical holographic QCD model: Resembling renormalization group from ultraviolet to infrared

Abstract

Resembling the renormalization group from ultraviolet (UV) to infrared (IR), we construct a dynamical holographic model in the graviton-dilaton-scalar framework, where the dilaton background field Φ and scalar field X are responsible for the gluodynamics and chiral dynamics, respectively. At the UV boundary, the dilaton field is dual to the dimension-4 gluon operator, and the scalar field is dual to the dimension-3 quark-antiquark operator. The metric structure at IR is automatically deformed by the nonperturbative gluon condensation and chiral condensation in the vacuum. The produced scalar glueball spectra in the graviton-dilaton framework agree well with lattice data, and the light-flavor meson spectra generated in the graviton-dilaton-scalar framework are in good agreement with experimental data. Both the chiral symmetry breaking and linear confinement are realized in this dynamical holographic QCD model.