7–11 Jul 2025
America/Toronto timezone

Boosted dark matter from semi-annihilations in the galactic center

9 Jul 2025, 11:00
20m
B2416

B2416

Speaker

Dr Takashi Toma (Kanazawa University)

Description

In some scenarios, the dark matter relic abundance is set by the semi-annihilation of two dark matter particles into one dark matter particle and one Standard Model particle. These semi-annihilations might still be occurring today in the Galactic Center at a significant rate, generating a flux of boosted dark matter particles. We investigate the possible signals of this flux component in direct detection and neutrino experiments for sub-GeV dark matter masses. We show that for typical values of the semi-annihilation cross-section, the sensitivity of current experiments to the spin-independent dark matter-proton scattering cross-section can be several orders of magnitude larger than current constraints from cosmic-ray boosted dark matter. We also argue that the upcoming DARWIN and DUNE experiments may probe scattering cross-sections as low as $\mathcal{O}(10^{-37})~\mathrm{cm}^2$ for masses between 30 MeV and 1 GeV.

Authors

Alejandro Ibarra (Technical University of Munich) Boris Betancourt Kamenetskaia (Technical University of Munich) Dr Motoko Fujiwara (University of Toyama) Dr Takashi Toma (Kanazawa University)

Presentation materials