Flavour specific neutrino self-interaction: $H_0$ tension and IceCube

Understand

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.