Indirect detection of neutralino dark matter candidates in anomaly-mediated supersymmetry breaking scenarios

Abstract

We consider a model for neutralino dark matter candidates arising in anomaly-mediated supersymmetry breaking schemes, and examine its testability through the search for exotic cosmic rays produced by neutralino pair annihilations in the dark halo of the Galaxy. We find that the model is already constrained by available antiprotons and positrons measurements and may be further tested in upcoming measurements of these cosmic ray species. We show also that the monochromatic gamma-ray flux from neutralino annihilations is enhanced in this model up to two orders of magnitude with respect to alternative scenarios. The gamma-ray flux detected by the Energetic Gamma Ray Experiment Telescope in the direction of the Galactic center exceeds significantly the theoretical expectation of standard emission models. We prove that if at least 10% of this excess is due to gamma-ray radiation with continuum energy spectrum from neutralino annihilations in the model under investigation, the associated gamma-ray line will be detected by upcoming gamma-ray experiments.