Hadrons as holograms

TL;DR

This paper reviews recent advances in holographic QCD models using gauge/gravity duality, focusing on hadron spectra, diquark correlations, Wilson loops, and glueball properties, to better understand strong-interaction physics.

Contribution

It introduces new holographic models that accurately reproduce hadron spectra, diquark effects, and QCD phenomena through innovative gravity dual solutions.

Findings

Reproduces linear hadron mass trajectories

Accurately describes nucleon excitation spectrum

Calculates glueball correlators and decay constants

Abstract

We review our recent work on four topics in strong-interaction physics from the perspective of the gauge/gravity correspondence. In particular, we discuss (i) the construction of the ``metric soft wall'' dual for holographic QCD which reproduces the observed linear square-mass trajectories of radially and orbitally excited (light-quark) hadrons, (ii) an extension of the metric soft wall which encodes diquark correlations holographically and additionally leads to an excellent description of the empirical nucleon excitation spectrum, (iii) an AdS/QCD dual that emerges as a new solution of 5d Einstein-dilaton gravity with a specifically derived potential and realizes the area law of the Wilson loop and (approximately) linear meson trajectories dynamically, and finally (iv) the calculation of glueball correlation functions and decay constants in both the hard- and dilaton soft-wall gravity duals, as well as a quantitative analysis of their QCD-relevant physics content.