The holographic light-front QCD framework provides a unified nonperturbative description of the hadron mass spectrum, form factors and quark distributions. In this article we extend holographic QCD in order to describe the gluonic distribution in both the proton and pion from the coupling of the metric fluctuations induced by the spin-two Pomeron with the energy momentum tensor in anti--de Sitter space, together with constraints imposed by the Veneziano model{\color{blue},} without additional free parameters. The gluonic and quark distributions are shown to have significantly different effective QCD scales.
@article{arxiv.2107.01231,
title = {Gluon matter distribution in the proton and pion from extended holographic light-front QCD},
author = {Guy F. de Téramond and H. G. Dosch and Tianbo Liu and Raza Sabbir Sufian and Stanley J. Brodsky and Alexandre Deur},
journal= {arXiv preprint arXiv:2107.01231},
year = {2021}
}