Modes with variable mass as an alternative in AdS / QCD models with chiral symmetry breaking

TL;DR

This paper introduces a novel approach to chiral symmetry breaking in AdS/QCD models by allowing the bulk scalar mass to vary with the holographic coordinate, improving meson spectrum predictions.

Contribution

It proposes variable mass modes in soft wall models as an alternative method for incorporating chiral symmetry breaking in AdS/QCD.

Findings

Good meson spectra achieved with current quark masses in one model.

Other models require larger quark masses for similar results.

Variable mass modes enhance the flexibility of holographic QCD models.

Abstract

We consider a new possibility of incorporating chiral symmetry breaking in soft wall models with a quadratic dilaton and AdS metric. In particular, we allow the mass of the scalar modes propagating in the bulk to have a dependence on the holographical coordinate. In one of the models that we discuss, it is possible obtain a good meson spectra considering current quark masses, and in the other two models considered, good results can be obtained at the expense of considering rather large quark masses.