  We test the hypothesis that diffractive scattering in the perturbative and
non-perturbative domain is determined by the exchange of a single pomeron with
a scale dependent trajectory. Present data on diffractive vector meson
production are well compatible with this model and recent results for $J/\psi$
photoproduction at LHC strongly support it. The model is inspired by concepts
of gauge/string duality applied to the pomeron.
