Superradiant instability of charged scalar fields in higher-dimensional Reissner-Nordstr\"om-de Sitter black holes

Understand

Black holes possess trapping regions which lead to intriguing dynamical effects.

• By properly scattering test fields off a black hole, one can extract energy from it, leading to the growth of the amplitude of the test field in expense of the black hole's energy.
• Such a dynamical phenomenon is called superradiance.
• Here, we study charged-scalar-field instabilities of Reissner-Nordstr\"{o}m black holes immersed in a $d-$dimensional de Sitter Universe.