Kerr-de Sitter and Kerr-anti-de Sitter black holes as accelerators for spinning particles

It is shown that the Kerr black hole could act as an accelerator for spinning particles. In principle, it could obtain arbitrarily high energy for an extremal Kerr black hole. In this paper, we extend the previous research to the Kerr-(anti-)de Sitter background and find that the cosmological constant plays an important role on the result. For the case of Kerr-anti-de Sitter black holes, like the Kerr background, only the extremal Kerr-anti-de Sitter black holes can have a divergent center-of-mass energy of collision. While, for the case Kerr-de Sitter black holes, the collision of two spinning particles can take place on the outer horizon as well as cosmological horizon of the black holes and the center-of-mass energy of collision can blow up if one of the collision particle takes the critical angular momentum. Hence, nonextremal Kerr-de Sitter black holes could also act as accelerators with arbitrarily high center-of-mass energy for spinning particles.