Particle attenuation within dark matter spikes

Dark matter particles may scatter off standard model particles in the inner regions of Active Galactic Nuclei, altering the emitted fluxes of high-energy neutrinos and gamma-rays observable at Earth. The dark matter density may be enhanced in the vicinity of the central black hole, forming a dark matter spike at sub-parsec distances. This allows to set strong constraints on the dark matter couplings to neutrinos, photons, protons and electrons, and perhaps hint a detection from NGC 1068.