Nucleon electromagnetic and gravitational form factors from holography

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.

11.25.Tq
14.20.Dh
11.25.Wx
11.10.Kk
nucleon: form factor
form factor: electromagnetic
space-time: anti-de Sitter
quantum chromodynamics: holography
dilaton: background
field theory: Dirac

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