Synchrotron Radiation from the Galactic Center in Decaying Dark Matter Scenario

Understand

We discuss the synchrotron radiation flux from the Galactic center in unstable dark matter scenario.

• Motivated by the anomalous excess of the positron fraction recently reported by the PAMELA collaboration, we consider the case that the dark matter particle is unstable (and long-lived), and that energetic electron and positron are produced by the decay of dark matter.
• Then, the emitted electron and positron becomes the source of the synchrotron radiation.
• We calculate the synchrotron radiation flux for models of decaying dark matter, which can explain the PAMELA positron excess.