Speaker
Description
This work explores the extraction of energy from electrostatic black holes through the decay or splitting of electrically charged particles. We establish the energetic criteria for viable extraction, deriving a general expression for the efficiency that depends on black hole and particle parameters. Focusing on Reissner-Nordström (RN) and Reissner-Nordström-de Sitter (RNdS) black holes, we analyze scenarios with non-vanishing particle angular momentum. Notably, the RNdS case reveals two distinct energy extraction regions: the generalized ergosphere and a cosmological ergosphere induced by the cosmological horizon. Under specific conditions, these ergospheres merge, enabling energy extraction throughout the whole region between the event and cosmological horizons.
