2018/05/31 by Qiqi Zhang, Leonardo Modesto, Cosimo Bambi · 16 citations
Mathematics · Physics and Astronomy · #Angular momentum #Astrophysical Phenomena and Observations #Black Holes and Theoretical Physics #Black hole (networking) #Classical mechanics #Conformal map #Event horizon #Extremal black hole #Geodesic #Geometry #Gravitation #Horizon #Kerr metric #Mathematical physics #Mathematics #Physics #Pulsars and Gravitational Waves Research #Quantum mechanics #Rotating black hole #Schwarzschild radius #Spacetime #gr-qc
paper · pdf · doi:10.1140/epjc/s10052-018-5987-6
published in The European Physical Journal C 78(6) (Springer Science+Business Media) · 9 pages, 4 figures. v2: refereed version
openalex created_date 2018/05/07 · openalex publication_date 2018/06/01 · arxiv created 2018/06/22 · arxiv updated 2018/06/25 · openalex updated_date 2026/08/05
We study some general properties of two black hole solutions in Einstein’s conformal gravity. Both solutions can be obtained from the Kerr metric with a suitable conformal rescaling, which leads, respectively, to a regular and a singular spacetime. In addition to the mass M and the spin angular momentum J of the black hole, these solutions are characterized by a new parameter, L , which may be expected to be of the order of the black hole mass. We study the geodesic motion and we calculate the radiative efficiency of a putative accretion disk around these black holes, which allows us to get an estimate of an upper bound on the value of L . Lastly, we explore the possibility of “destroying” the event horizon of these black holes. Within our approach, we are not able to destroy the event horizon of the regular black hole solution, while we can in the case of the singular one.