Accommodate chiral symmetry breaking and linear confinement in a dynamical holographic QCD model

TL;DR

This paper develops a holographic QCD model that simultaneously captures chiral symmetry breaking and linear confinement, aligning with key QCD phenomena through a graviton-dilaton-scalar system.

Contribution

It introduces a self-consistent holographic model incorporating a dimension-2 dilaton and scalar fields to realize both confinement and chiral symmetry breaking.

Findings

Reproduces Regge spectra of hadrons

Achieves linear quark-antiquark potential

Excludes negative dilaton background

Abstract

We construct a self-consistent holographic QCD model which can realize two most important phenomena of QCD, i.e. chiral symmetry breaking and confinement. The model is formulated in the framework of graviton-dilaton-scalar system, where the dilaton field is of dimension-2 which might be dual to the dimension-2 gluon condensate and can lead to the linear confinement, while the scalar field corresponds to the quark anti-quark condensate and can explain the property of chiral dynamics. Within this framework, both Regge spectra of hadrons and the linear potential between quarks can be accommodated. It is also found that the negative dilaton background can be safely excluded in this framework.