Discriminating different scenarios to account for the cosmic $e^\pm$ excess by synchrotron and inverse Compton radiation

Understand

The excesses of the cosmic positron fraction recently measured by PAMELA and the electron spectra by ATIC, PPB-BETS, Fermi and H.E.S.S.

• indicate the existence of primary electron and positron sources.
• The possible explanations include dark matter annihilation, decay, and astrophysical origin, like pulsars.
• In this work we show that these three scenarios can all explain the experimental results of the cosmic $e^\pm$ excess.