Destroying Extremal Kerr–Newman-AdS Black Holes with Test Particles

Neglecting the self-force, self-energy and radiative effects, we follow the spirit of Wald's gedanken experiment and further discuss whether an extremal Kerr–Newman-AdS (KNA) black hole can turn into a naked singularity when it captures charged and spinning massive particles. It is found that feeding a test particle into an extremal KNA black hole could lead to a violation of cosmic censorship for the black hole.