Neutrino Portal Dark Matter: From Dwarf Galaxies to IceCube

Understand

It has been suggested that the baseline scenario of collisionless cold dark matter over-predicts the numbers of satellite galaxies, as well as the dark matter (DM) densities in galactic centers.

• This apparent lack of structure at small scales can be accounted for if one postulates neutrino-DM and DM-DM interactions mediated by light O(MeV) force carriers.
• In this letter, we consider a simple, consistent model of neutrinophilic DM with these features where DM and a "secluded" SM-singlet neutrino species are charged under a new $U(1)$ gauge symmetry.
• An important ingredient of this model is that the secluded sector couples to the Standard Model fields only through neutrino mixing.