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Being able to safely distinguish astrophysical from potential dark matter(DM) annihilation signals is of utmost importance for indirect DM searches. Tothis end, one has to rely on distinctive -- and unique -- spectral signaturesto look for. Internal bremsstrahlung (IB), unavoidable in the presence ofcharged annihilation products, provides such a signature. In fact, as itgenerically dominates the gamma-ray spectrum expected from DM annihilations, athigh energies, it may well turn out to be more important for indirect DMsearches than the traditionally looked-for line signals. As illustrated in somedetail, the observation of IB signatures would even allow to distinguishbetween different DM candidates or to constrain significantly the parameterspace of, e.g., neutralino DM. The gamma-ray contributions reported here aretherefore of great interest for the already launched Fermi/GLAST satellite andthe upcoming new generation of Air Cherenkov Telescope systems like CTA --which are most sensitive at the high energies where these effects areparticularly important. Finally, radiative corrections may even significantlyalter the positron spectrum from DM annihilations; an intriguing positronexcess recently found by the PAMELA satellite might turn out to be anindication of the peculiar spectral signature expected in that case.

Dark Matter Annihilation Signals: The Importance of Radiative Corrections