Astrophysical observables for regular black holes with sub-Planckian curvature
arXiv:2207.07529 · doi:10.1088/1674-1137/acd530
Abstract
We investigate the photon sphere and the extremal stable circular orbit (ESCO) for massive particles over a recently proposed regular black holes with sub-Planckian curvature and Minkowskian core. We derive the effective potential for geodesic orbits and determine the radius of circular photon orbits, with an analysis on the stability of these orbits. We extend our analysis to the background of compact massive object (CMO) without horizon, whose mass is below the lowest bound for the formation of a black hole. For massive particles, the ESCOs become double-valued in CMO phase and we calculate the innermost stable circular orbits (ISCO) and the outermost stable circular orbits (OSCO). By comparing wih Bardeen black hole and Hayward black hole, it is also found that the locations of photon sphere and ESCO in CMO phase with Minkowskian core are evidently different from the ones in CMO phase with dS core, which potentially provides a way to distinguish these two sorts of black holes by astronomical observation.
V1:23pages,8figures,V2:Changed the annotation format of figure 3, two clerical errors were corrected on pages 18,19, no physics changes
References in corpus (7)
- First M87 Event Horizon Telescope Results. I. The Shadow of the Supermassive Black Hole
- First Sagittarius A* Event Horizon Telescope Results. I. The Shadow of the Supermassive Black Hole in the Center of the Milky Way
- Light ring stability in ultra-compact objects
- Magnetically charged black holes from non-linear electrodynamics and the Event Horizon Telescope
- Connection between black-hole quasinormal modes and lensing in the strong deflection limit
- Circular geodesics of Bardeen and Ayon-Beato-Garcia regular black-hole and no-horizon spacetimes
- Modified regular black holes with time delay and 1-loop quantum correction