Destroying Kaluza–Klein black holes

We investigate the destroying of charged and rotating black holes in Einstein–Maxwell-(dilaton) theory. We show that a test particle with some appropriate properties in the black hole background can turn the black hole into a naked singularity. In this work, we neglect the self-force, self-energy and radiative effects as considered by some others in literature. As the result, we are able to show that the Kaluza–Klein black holes can be destroyed by the test particle. Furthermore, we consider the overspinning of the black hole by a neutral test scalar field.