Flavour specific neutrino self-interaction: H0 tension and IceCube

Abstract

Self interaction in the active neutrinos is studied in the literature to alleviate the H0 tension. Similar self-interaction can also explain the observed dips in the flux of the neutrinos, coming from the distant astro-physical sources, in IceCube detectors. In contrast to the flavour universal neutrino interactions considered for solving the H0 tension, which is ruled out from particle physics experiments, we consider flavour specific neutrino interactions in CMB and IceCube data. We show that the values of self-interaction coupling constant and mediator mass required for explaining the IceCube dips are inconsistent with the strong neutrino self-interactions preferred by the combination of the HST and Planck data. However, the smaller amount of self-interaction between ?? can explain the resonant absorption features in IceCube data and help in solving the H0 tension.