Toward a more realistic holographic QCD model

TL;DR

This paper develops a more realistic holographic QCD model by matching string theory configurations with meson spectra, demonstrating consistency with experimental data for specific brane backgrounds.

Contribution

It introduces a 5D soft-wall model based on Dp-Dq systems that aligns string theory with meson Regge trajectories, enhancing the realism of holographic QCD models.

Findings

The 5D metric parameters depend on Regge trajectory parameters.

Models with p=3 or 4 are consistent with experimental meson data.

A method to match string theory systems with meson spectra has been established.

Abstract

By matching the $Dp-Dq$ system in type II superstring theory with the Regge trajectories of vector and axial-vector meson spectra, a possible 5-dimension metric of a $Dp-Dq$ soft-wall model has been determined. The dependence of the metric parameters on Regge trajectory parameters has been demonstrated. It is shown that the models defined in $Dp$ brane background for $p=3$ or 4 can be consistent with experimental data.