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Résumé |
Indirect signatures for dark matter annihilations or decays in the halo of our
Galaxy are expected in the form of high-energy cosmic rays. In particular, cosmic
antiparticles are expected to be rare in Galactic cosmic rays, and thus more
sensitive to any excess from exotic processes. In order to firmly identify dark
matter signals using cosmic antimatter, a robust assessment of the background coming
from standard astrophysical processes is essential. This offers the unique
opportunity to address compelling questions on the origin of Galactic cosmic
radiations, their acceleration, and on their propagation in the interstellar
environment. In this talk I will discuss the current status of the search for WIMP
dark matter signals using cosmic positrons, antiprotons and anti-nuclei measured at
Earth, and the interpretation of the tentative excesses reported for each of these
species. I will focus on the recent endeavor of (1) characterizing the main
astrophysical candidates to explain the positron excess, Galactic pulsars, through
the multiwavelength observations of pulsar halos, and of (2) deriving robust
constraints on dark matter theories from antiproton measurements, combining them
with insights from direct and collider searches. |
