Séminaire de Physique ThéoriqueIndirect dark matter searches with cosmic rays
Mathieu Boudaud (LAPTh d’Annecy)
Thursday 09 February 2017 14:00 - Tours - Salle 1180 (Bât E2)
This seminar focuses on indirect dark matter searches through the study of cosmic rays fluxes. The first part of the talk provides an overview of current searches on dark matter and then focuses on the production and propagation of cosmic rays. The second part is devoted to cosmic ray antiprotons. The influence of low energy propagation effects on the antiproton flux is explored. New constraints on WIMPs are derived from the data of the PAMELA collaboration. The theoretical uncertainties on the astrophysical background are assessed. The interpretation of the preliminary data of the AMS-02 collaboration for the antiproton to proton ratio and the implications for dark matter properties are finally discussed. The third part is devoted to the interpretation of the positron flux measured by the AMS-02 collaboration. The possibility to explain the data by the presence of dark matter in the Galaxy is studied. An alternative explanation involving nearby pulsars is examined. Then, we present a new method, « the pinching method », that enables us to predict the electron and positron flux below few tens of GeV, where more propagation effects are at stake. Constraints on dark matter property are derived using the AMS-02 data and the Voyager data. These constraints are competitive with the most stringent ones provided by the CMB.