Göttingen 2025 – scientific programme
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T: Fachverband Teilchenphysik
T 41: Search for Dark Matter II
T 41.1: Talk
Tuesday, April 1, 2025, 16:15–16:30, VG 4.102
Indirect Searches for Dark Matter with COSI — •Haoyu Xie1,2, Savitri Gallego1,2, Jan Lommler1,2, and Uwe Oberlack1,2 — 1Johannes Gutenberg-Universität Mainz, Institut für Physik & ETAP - Experimentelle Teilchen- und Astroteilchen Physik — 2On behalf of the COSI Collaboration
The NASA MeV mission COSI (Compton Spectrometer and Imager), to be launched in 2027, offers significantly improved sensitivity at high energy resolution and for diffuse emission due to a large field-of-view in the 0.2-5 MeV energy range. This energy range is particularly intriguing for indirect searches of dark matter, as sub-GeV DM candidates are still little constraint by direct searches, but could be detected indirectly as they either annihilate or decay into detectable gamma rays. In this work, we study the sensitivity of COSI to DM in the framework of a dark photon portal, exploring scenarios where sub-GeV dark matter annihilates into leptons, producing continuum gamma-ray signals. We also discuss opportunities to search for primordial black holes (PBHs) and sterile neutrino decays.
Keywords: Dark matter; COSI; Dark photon; Primordial black holes; sub-GeV