Title:"Blazar constraints on neutrino-dark matter scattering"
Neutrino emission in coincidence with gamma rays has been observed for the first time by the IceCube telescope from the blazar TXS 0506+056 in 2017. Such observation implies that neutrinos produced in the blazar jet had to travel through the dense dark matter (DM) density around the central black hole before being able to reach the detector on Earth. In this talk, I will explain how the study of the neutrino flux attenuation from the aforementioned blazar allows us to set an upper bound on the neutrino-DM scattering cross section, as a function of the DM mass. Surprisingly, this bound turns out to be the strongest limit for sub-GeV DM in the literature if the cross section rises linearly with energy and becomes competitive to existing bounds if the cross section is energy-independent.