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It is shown that the Kerr black hole could act as accelerators for spinningparticles. In principle, it could obtain arbitrarily high energy for extremalKerr black hole. In this paper, we extend the previous research to theKerr-(anti-)de Sitter background and find that the cosmological constant playsan important role in the result. For the case of Kerr-anti-de Sitter blackholes, like the Kerr background, only the extremal Kerr-anti-de Sitter blackholes can have a divergent center-of-mass energy of collision. While, for thecase of Kerr-de Sitter black holes, the collision of two spinning particles cantake place on the outer horizon of the black holes and the center-of-massenergy of collision can blow up if one of the collision particle takes thecritical angular momentum. Hence, non-extremal Kerr-de Sitter black holes couldalso act as accelerators with arbitrarily high center-of-mass energy forspinning particles.

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