Antiproton signatures from astrophysical and dark matter sources at the
  galactic center
  The center of our Galaxy is a complex region characterized by extreme
phenomena. The presence of the supermassive Sagittarius A* black hole, a high
Dark Matter density and an even higher baryonic density are able to produce
very energetic processes. Indeed, high energetic gamma rays have been observed
by different telescopes, although its origin is not clear. In this work, we
constrain the possible antiproton flux component associated to this signal. The
expected secondary astrophysical antiproton background already saturates the
observed data. It implies that any other important astrophysical source leads
to an inconsistent excess, since the theoretical uncertainties corresponding to
the mentioned background are small. The constraints depend on the diffusion
model and the spectral features of the source. In particular, we consider
antiproton spectra described by a power-law, a monochromatic signal and a
Standard Model particle-antiparticle channel production.
