2018/12/18 by M. Shahzadi, Z. Yousaf, Saeed Ullah Khan
Physics and Astronomy · #Astrophysical Phenomena and Observations #Black Holes and Theoretical Physics #Black hole (networking) #Circular motion #Dimensionless quantity #Geodesic #Penrose process #Photon #Quantum Electrodynamics and Casimir Effect #Rotating black hole #Spin (aerodynamics) #gr-qc #hep-th
paper · pdf · doi:10.1016/j.dark.2019.100263
published as Phys. Dark Universe 24, 100263 (2019) · 24 pages, 9 figures
arxiv created 2018/12/18 · openalex created_date 2019/01/11 · openalex publication_date 2019/01/27 · arxiv updated 2021/01/08 · openalex updated_date 2026/08/05
This paper explores the circular geodesics of neutral test particles on an equatorial plane around a rotating black hole. After using equations of motion of scalar-tensor-vector gravity with the circular geodesics of null-like particles, we find the equation of photon orbit. With the help of an effective potential form, we have examined the stable regimes of photons orbits. The Lyapunov exponent, as well as the effective force acting on photons, is also investigated. We examine the energy extraction from a black hole via Penrose process. Furthermore, we discuss the negative energy state and the efficiency of energy extraction. We have made compare our results with that obtained for some well known black holes models. We concluded that the efficiency of the energy extraction decreases with the increase of dimensionless parameter of theory and increases as spin parameter increases.