Weaker yet again: mass spectrum-consistent cosmological constraints on the neutrino lifetime

Joe Zhiyu Chen, Isabel M. Oldengott, Giovanni Pierobon +1

We consider invisible neutrino decay ${\nu }_H\to {\nu }_l+\varphi$ in the ultra-relativistic limit and compute the neutrino anisotropy loss rate relevant for the cosmic microwave background (C…