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Multimessenger constraints on the annihilating dark matter interpretation of the positron excess

Abstract : The rise in the energy spectrum of the positron ratio, observed by the PAMELA satellite above 10 GeV, and other cosmic-ray measurements, have been interpreted as a possible signature of dark matter annihilation in the Galaxy. However, the large number of free parameters, and the large astrophysical uncertainties, make it difficult to draw conclusive statements about the viability of this scenario. Here, we perform a multiwavelength, multimessenger analysis, that combines in a consistent way the constraints arising from different astrophysical observations. We show that if standard assumptions are made for the distribution of dark matter (we build models on the recent Via Lactea II and Aquarius simulations) and the propagation of cosmic rays, current dark matter models cannot explain the observed positron flux without exceeding the observed fluxes of antiprotons or gamma-ray and radio photons. To visualize the multimessenger constraints, we introduce “star plots,” a graphical method that shows in the same plot theoretical predictions and observational constraints for different messengers and wavelengths.
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Miguel Pato, Lidia Pieri, Gianfranco Bertone. Multimessenger constraints on the annihilating dark matter interpretation of the positron excess. Physical Review D, 2009, 80, ⟨10.1103/PhysRevD.80.103510⟩. ⟨hal-03646224⟩

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