Energy extraction via magnetic reconnection in Lorentz breaking Kerr???Sen and Kiselev black holes

Black holes can accumulate a large amount of energy, responsible for highly energetic astrophysical phenomena. Although the Blandford-Znajek is considered to date the leading mechanism for powering jets and GRBs, recently fast magnetic reconnection (MR) of the magnetic field was proposed as a new way to extract energy. In this paper, we investigate this phenomena in a bumblebee KerrSen BH, which differentiates from standard Kerr solution via a Lorentz symmetry breaking parameter similar to and an electric charge one b. We find that the presence of the charge parameter strongly changes the simple Kerr case, making this extraction mechanism possible even for not extremely rotating black holes (a similar to 0.7). We also show that, under appropriate circumstances, MR ismore efficient compared to the Blandford-Znajek mechanism. We finally compare these results with dark energy (quintessence) black-hole solutions. In this case, we find that aKerr black hole is indistinguishable from a rotational Kiselev one, whatever the energy-matter that surrounds it (including ordinary matter, such as dust and radiation).