Soft-wall modelling of meson spectra

TL;DR

This paper reviews the use of soft-wall holographic models inspired by gauge/gravity duality to describe meson spectra, including generalizations for Regge trajectories and chiral symmetry breaking.

Contribution

It introduces a generalized soft-wall model for meson spectra with arbitrary intercepts and discusses methods to incorporate chiral symmetry breaking.

Findings

Reproduces linear Regge trajectories for light mesons.

Proposes a generalized soft-wall model for arbitrary intercepts.

Discusses incorporation of chiral symmetry breaking.

Abstract

The holographic methods inspired by the gauge/gravity correspondence from string theory have been actively applied to the hadron spectroscopy in the last eleven years. Within the phenomenological bottom-up approach, the linear Regge-like trajectories for light mesons are naturally reproduced in the so-called "Soft-wall" holographic models. I will give a very short review of the underlying ideas and technical aspects related to the meson spectroscopy. A generalization of soft-wall description of Regge trajectories to arbitrary intercept is proposed. The problem of incorporation of the chiral symmetry breaking is discussed.