  The origin of the high-energy gamma-ray emission from the Milky Way center is
still unclear and debated because of the impact of systematics afflicting the
measurements from current experiments. Several theories and phenomenological
models attempt to explain the intricate panorama. The presence of a PeVatron in
the Central Molecular Zone or in its vicinity, the contribution of the
hard-component of the diffuse gamma-ray emission, and dark matter annihilation
scenario are among the most promising mechanisms for describing the observed
excess. The development of increasingly precise models able to reproduce the
measured gamma-ray emission is the challenge for the scientific community in
view of the next generation telescopes. A detailed treatment of
phenomenological models for the dubbed Cosmic Rays Sea (CR-sea) characterized
by different configurations is scrutinized in comparison with the observed
spectrum in the inner Galaxy, using DRAGON and GAMMASKY codes.
