2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/201285When scattering amplitudes are calculated in the double-logarithmic approximation, it is possible to relate the double-logarithmic on-shell and off-shell amplitudes. Explicit relations are obtained for scattering amplitudes in QED, QCD, and the ElectroWeak Standard Model. The off-shell amplitudes are considered in the hard and the Regge kinematic limits. We compare our results in both the Feynman and Coulomb gauges.15 pages, 3 figures; RevTeX4High Energy Physics - Phenomenologytext