Data di Pubblicazione:
2023
Abstract:
Radiative emissions from electrons and positrons generated by dark matter (DM)
annihilation or decay are one of the most investigated signals in indirect searches of WIMPs.
Ideal targets must have large ratio of DM to baryonic matter. However, such “dark” systems
have a poorly known level of magnetic turbulence, which determines the residence time of
the electrons and positrons and therefore also the strength of the expected signal. This
typically leads to significant uncertainties in the derived DM bounds. In a novel approach,
we compute the self-confinement of the DM-induced electrons and positrons. Indeed, they
themselves generate irregularities in the magnetic field, thus setting a lower limit on the
presence of the magnetic turbulence. We specifically apply this approach to dwarf spheroidal
galaxies. Finally, by comparing the expected synchrotron emission with radio data from the
direction of the Draco galaxy collected at the Giant Metre Radio Telescope, we show that
the proposed approach can be used to set robust and competitive bounds on WIMP DM.
Tipologia CRIS:
03A-Articolo su Rivista
Elenco autori:
Regis M.; Korsmeier M.; Bernardi G.; Pignataro G.; Reynoso-Cordova J.; Ullio P.
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