The self-confinement of electrons and positrons from dark matter

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 magneti...

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Published in:Journal of cosmology and astroparticle physics 2023-08, Vol.2023 (8), p.30
Main Authors: Regis, Marco, Korsmeier, Michael, Bernardi, Gianni, Pignataro, Giada, Reynoso-Cordova, Javier, Ullio, Piero
Format: Article
Language:English
Subjects:
Confinement
cosmic ray theory
Dark matter
dark matter theory
Dwarf galaxies
dwarfs galaxies
Electrons
Emissions
Magnetic fields
Positrons
Radio astronomy
Radio telescopes
Spheroidal galaxies
Synchrotrons
Turbulence
Weakly interacting massive particles
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Summary: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.
ISSN:1475-7516
1475-7516
DOI:10.1088/1475-7516/2023/08/030