Neutrino Quasinormal Modes of a Kerr-Newman-de Sitter Black Hole
  Using the P\"{o}shl-Teller approximation, we evaluate the neutrino quasinormal modes (QNMs) of a Kerr-Newman-de Sitter black hole. The result shows that for a Kerr-Newman-de Sitter black hole, massless neutrino perturbation of large $\Lambda$, positive $m$ and small value of $n$ will decay slowly. 
Jia-Feng Chang and You-Gen Shen