Speaker
Dr
Simone Ammazzalorso
(University of Turin & INFN)
Description
Dark Matter (DM) Weakly Intercactive Massive Particles (WIMPs) are expected to produce a gamma-ray emission via annihilation; on the other hand this signal should trace the matter distribution being originated from DM structures evolved from primordial perturbations.
The anisotropies of the unresolved component of the extra-galactic gamma-ray background (UGRB) hosts valuable information on the faint astrophysical sources and can hide a long-sought DM signal.
In order to extract information from this faint emission, a cross-correlation with gravitational tracers of matter in the Universe has been predicted to be a powerful tool.
We report the first statistically-significant detection of cross-correlation between the Dark Energy Survey (DES) Y1 cosmic shear catalogue and the gamma-ray sky measured by the Fermi-LAT.
Being mostly localized at small angular scales and high gamma-ray energy, the most likely interpretation is that the signal originates from blazar emission. The possibility of a DM contribution at the degree scale will be discussed.
Primary author
Dr
Simone Ammazzalorso
(University of Turin & INFN)
