  Astrophysical neutrinos travel long distances from their sources to the Earth
traversing dark matter halos of clusters of galaxies and that of our own Milky
Way. The interaction of neutrinos with dark matter may affect the flux of
neutrinos. The recent multi-messenger observation of a high energy neutrino,
IceCube-170922A, can give a robust upper bound $\sigma /M_{dm} \lesssim
5.1\times 10^{-23} {\rm cm}^2 /$GeV on the interaction between neutrino and
dark matter at a neutrino energy of 290 TeV allowing 90\% suppression.
Combining the constraints from CMB and LSS at different neutrino energies, we
can constrain models of dark matter-neutrino interactions.

Cosmology and Nongalactic Astrophysics;High Energy Physics - Phenomenology