Weekly seminars
Dark Matter constraints from the diffuse gamma-ray flux
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Europe/Paris
Auditorium Vivargent (Annecy-le-Vieux)
Auditorium Vivargent
Annecy-le-Vieux
Description
The measurement of the diffuse gamma-ray flux is one of the prominent tools
for indirect dark matter (DM) searches. We present a new computation of
the Galactic gamma-ray background in which cosmic-ray (CR) propagation
and gamma-ray emissivity are treated within a self-consistent model,
with particular attention to the gas distribution in the Galaxy. After
tuning propagation properties against local measurements of CR nuclei and
leptons, the gamma-ray flux is found to be in fairly good agreement with
Fermi data in all regions of the sky. Limits on possible contributions to
the gamma-ray flux from the pair annihilation of DM particles are
discussed, especially in connection with the recent claims of evidence
for a monochromatic feature at energies around 130 GeV from the inner Galaxy.