Abstract The Blandford–Znajek (BZ) process is a pivotal mechanism to efficiently extract the energy from a rotating black hole (BH) via its plasma-filled magnetosphere in relativistic astrophysics. Within the framework of extended BZ monopole expansion, we have studied BZ process in the Randall–Sundrum braneworld BH spacetime and analyzed effects of the tidal charge on the energy and angular momentum extraction rates. It is found that the positive tidal charge reduces the BZ power of a braneworld BH, while the negative tidal charge enhances the power. Compared with a Kerr BH of the same mass and angular velocity, the BZ power exhibits a maximum reduction of approximately 15. 2\% 15. 2 % in positive cases, whereas in negative cases, it achieves a maximum enhancement of 66. 5\% 66. 5 % in power output. A similar qualitative trend is also observed for the relative angular momentum extraction rate, albeit with different magnitudes.
Yang et al. (Fri,) studied this question.