Flavour specific neutrino self-interaction: H0 tension and IceCube

Self-interaction in the active neutrinos is studied in the literature to alleviate the H-0 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 interaction considered for solving the H-0 tension, which is ruled out from particle physics experiments, we consider flavour specific neutrino interactions. 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 BAO, HST and Planck data. However, the required amount of self-interaction between tau neutrinos (nu(tau)) in inverted hierarchy for explaining IceCube dips is consistent with the moderate self-interaction region of cosmological bounds at 1-sigma level. For the case of other interactions and hierarchies, the IceCube preferred amount of self-interaction is consistent with moderate self-interaction region of cosmological bounds at 2-sigma level only.

Automated summary

This article discusses the importance of self-interaction in active neutrinos for explaining the observed dips in the flux of neutrinos detected by IceCube detectors. Different flavors of neutrino interactions have different requirements for explaining this phenomenon.