The atomic nucleus plays a fundamental role in understanding the underlying innermost hadronic structure through high energy electron scattering experiments. However, such description cannot be achieved in terms of QCD
first principles and phenomenological models, like those here proposed, represent a valuable alternative. In this talk, we focus on the study of Generalized Parton Distribution functions, non-perturbative objects accessible in exclusive processes, e.g. Deeply Virtual Compton Scattering (DVCS), that connect the information achievable from elastic and inelastic scattering processes and give access to the 3D structure of the target in coordinate space. We present how the description of such processes o light nuclei can be performed using up-to-date and realistic nuclear ingredients, that consider nucleon-nucleon potentials and three body nuclear forces. These calculations, despite very involved, can be performed for few-body systems and, in particular, our results for DVCS off 4He are showed and compared with the recent data from Jefferson Laboratory.
The predictions obtained from our models for the DVCS cross section at the kinematics envisioned at the forth-coming EIC are also presented. These results show that there is a wide enough kinematic range to reach the tomography of the 4He nucleus, so that the distribution of partons in the transverse plane could be finally obtained, providing also a pictorial view of the realization of the European Muon Collaboration effect.