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Recent observations of high-energy neutrinos from active galactic nuclei(AGN), NGC 1068 and TXS 0506+056, suggest that cosmic rays (CRs) areaccelerated in the vicinity of the central supermassive black hole andhigh-energy protons and electrons can cool efficiently via interactions withambient photons and gas. The dark matter density may be significantly enhancednear the central black hole, and CRs could lose energies predominantly due toscatterings with the ambient dark matter particles. We propose CR cooling inAGN as a new probe of dark matter-proton and dark matter-electron scatterings.Under plausible astrophysical assumptions, our constraints on sub-GeV darkmatter can be the strongest derived to date. Some of the parameter spacefavored by thermal light dark matter models might already be probed withcurrent multimessenger observations of AGN.

Probing Light Dark Matter through Cosmic-Ray Cooling in Active Galactic Nuclei