Cosmic ray electron anisotropies as a tool to discriminate between exotic and astrophysical sources

Understand

Recent results from the PAMELA, ATIC, PPB BETS and Fermi collaborations extend the energy range in the electron flux measurement up to unexplored energies in the hundred GeVs range confirming the bump starting at about 10GeV already suggested by HEAT and AMS01 data .

• This bump can be explained by annihilating dark matter in the context of exotic physics, or by nearby astrophysical sources e.g.
• pulsars.
• In order to discriminate between competing models for primary positron production, the study of anisotropies ,complementary to the spectrum determination, shows up as new tool to look for the origin of the lepton excess.