Extracting energy from a non-Kerr rotating spacetime with an anomalous quadrupole moment via magnetic reconnection

Abstract This paper investigates how to extract energy from a non-Kerr rotating spacetime with an anomalous quadrupole moment via the Comisso–Asenjo magnetic reconnection mechanism. Unlike many other rotating spacetimes, this spacetime possesses closed timelike curves, and the corresponding spacetime regions must be excluded when extracting energy. After introducing the event horizon, ergosphere, and closed timelike curves of this spacetime, we deeply analyze the energy per unit enthalpy at infinity for accelerated and decelerated plasmas, the allowed region for energy extraction, and the power and efficiency of energy extraction. The results show that energy extraction is possible for both positive and negative anomalous quadrupole moments, but a positive and small anomalous quadrupole moment corresponds to higher power and efficiency of energy extraction.