Karlsruhe 2024 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 110: Search for Dark Matter 5

T 110.2: Vortrag

Freitag, 8. März 2024, 09:15–09:30, Geb. 30.22: Gaede-HS

MHz to TeV expectations from scotogenic WIMP dark matter — •Laura Eisenberger, Thomas Siegert, Karl Mannheim, and Werner Porod — University of Würzburg

Most efforts on the indirect search for dark matter (DM) focus on the high-energy photons directly produced by DM annihilation. However, such prompt signals alone are too weak to be measurable in large astrophysical fore- and backgrounds. Following a multiwavelength approach, the secondary emission from charged annihilation products should be also taken into account.

In our study, we investigate scotogenic DM with a mass around 1 TeV which is consistent with various experimental limits. Scotogenic WIMPs arise in models where an additional symmetry ensures both the existence of a stable DM candidate and the generation of neutrinos masses through couplings to the dark sector.

We present our calculations of the DM photon spectrum in 27 dwarf galaxies of the Milky Way reaching from synchrotron emission in the MHz range to the Inverse Compton peak at MeV energies and to the prompt signature in the GeV up to TeV regime. This unique "triple hump" structure will be easily distinguishable from any other source. We estimate the fore- and background emission from the Milky Way and AGN along the line-of-sight. We find signal-to-background ratios on the order of 1e-3 between 1 keV and 100 GeV. In the light of upcoming observatories like COSI-SMEX and CTA, the detection of faint DM signals is within reach if a coherent analysis across the MeV to GeV range is applied.

Keywords: dark matter; WIMPs; dwarf galaxies; multiwavelength