2020/01/31 by Avirup Ghosh, Arpan Kar, Biswarup Mukhopadhyaya · 6 citations
Physics and Astronomy · #Astrophysics and Cosmic Phenomena #Dark Matter and Cosmic Phenomena #Dark matter #Flux (metallurgy) #Particle physics theoretical and experimental studies #Radio telescope #Scalar (mathematics) #Standard Model (mathematical formulation) #Synchrotron #Telescope #Weakly interacting massive particles #astro-ph.HE #hep-ph
paper · pdf · doi:10.1088/1475-7516/2020/09/003
published in Journal of Cosmology and Astroparticle Physics 2020(09), 003 (Institute of Physics) · 28 pages, 11 figures, matches with the version published in JCAP
openalex created_date 2020/01/30 · openalex publication_date 2020/09/01 · arxiv created 2020/09/04 · arxiv updated 2020/09/07 · openalex updated_date 2026/08/05
We investigate and compare the possibilities of observing decaying dark matter (DM) in γ-ray and radio telescopes. The special emphasis of the study is on a scalar heavy DM particle with mass in the trans-TeV range. DM decays, consistent with existing limits on the lifetime, are assumed to be driven by higher dimensional effective operators. We consider both two-body decays of a scalar dark particle and a dark sector having three-body decays, producing two standard model particles. It is found that the Fermi-LAT data on isotropic γ-ray background provides the best constraints so far, although the CTA telescope may be more effective for decays where one or two photons are directly produced. In all cases, deeper probes of the effective operators are possible in the upcoming SKA radio telescope with a few hundred hours of observation, using the radio synchrotron flux coming from energetic electrons produced in the decay cascades within dwarf spheroidal galaxies. Finally, we estimate how the SKA can constrain the parameter space spanned by the galactic magnetic field and the diffusion coefficient, if observations consistent with γ-ray data actually take place.