Kerr–de Sitter black holes: quantum aspects and cosmic censorship conjecture

Abstract In this article, we test the validity of the weak cosmic censorship conjecture (wCCC) in the background of a quantum Kerr–de Sitter (qKdS) black hole, incorporating exact backreaction from quantum matter fields. Using a test particle approach, we analyze whether an extremal qKdS black hole can be over-extremized to expose a naked singularity. Our results indicate that the black hole remains stable against horizon-destroying processes induced by infalling matter. Quantum corrections enhance the horizon’s robustness rather than destabilize it, offering further evidence that wCCC remains preserved in the presence of quantum effects.