Nucleon electromagnetic and gravitational form factors from holography

TL;DR

This paper uses holographic AdS/QCD models to compute nucleon electromagnetic and gravitational form factors, comparing hard-wall and soft-wall approaches to understand nucleon structure.

Contribution

It introduces calculations of both electromagnetic and gravitational form factors of nucleons within a holographic framework, incorporating different AdS cutoff models.

Findings

Electromagnetic form factors are derived from a Dirac field coupled to a vector field.

Gravitational form factors are obtained by metric perturbations in AdS space.

Comparison between hard-wall and soft-wall models highlights differences in nucleon structure predictions.

Abstract

The electromagnetic form factors of nucleons are calculated using an AdS/QCD model by considering a Dirac field coupled to a vector field in the 5-dimensional AdS space. We also calculate a gravitational or energy-momentum form factor by perturbing the metric from the static AdS solution. We consider both the hard-wall model where the AdS geometry is cutoff at z_0 and the soft-wall model where the geometry is smoothly cut off by a background dilaton field.