An AdS/QCD model from Sen's tachyon action

TL;DR

This paper develops a new AdS/QCD model incorporating Sen's tachyon action, successfully describing chiral symmetry breaking and fitting meson spectra with minimal parameters, thus improving upon previous models.

Contribution

Introduces a novel AdS/QCD model using Sen's tachyon action to better capture chiral symmetry breaking and meson spectra.

Findings

Achieves 10-15% accuracy in meson mass predictions

Models chiral symmetry breaking via tachyon dynamics

Improves qualitative aspects of previous AdS/QCD models

Abstract

We construct a new, simple phenomenological model along the lines of AdS/QCD. The essential new ingredient is the brane-antibrane effective action including the open string tachyon proposed by Sen. Chiral symmetry breaking happens because of tachyon dynamics. We fit a large number of low-spin meson masses at the 10%-15% level. The only free parameters involved in the fits correspond to the overall QCD-scale and the quark masses. Several aspects of previous models are qualitatively improved.