  We analyse processes of particle acceleration in the Fermi Bubbles. The goal
of our investigations is to obtain restrictions for acceleration mechanisms.
Our analysis of the three processes: acceleration from background plasma,
re-acceleration of relativistic electrons emitted by supernova remnants, and
acceleration by shocks generated by processes of star tidal disruption in the
Galactic Center, showed that the model of multi-shock acceleration does not
have serious objections at present and therefore seems us more attractive than
others.

High Energy Astrophysical Phenomena