Bound orbits near black holes with scalar hair
arXiv:1912.03654 · doi:10.1088/1742-6596/1390/1/012097
Abstract
We consider spherically symmetric black holes with minimally coupled scalar fields and concentrate our attention on asymptotically flat self-gravitating configurations having the event horizons located at radii much smaller than . We think of such configurations as rigorous mathematical models of the gravitating objects, surrounded by dark matter, in the centres of normal galaxies. It turns out that the radius of the event horizon of a scalar field black hole always less than the Schwarzschild radius of vacuum black hole of the same mass and can be arbitrary close to zero. In astronomical observations, a key role in distinguishing between black holes, wormholes, and naked singularities plays measuring parameters of bound quasiperiodic orbits, in particular, the shape of an orbit and the angle of precession of its pericentre. We consider a typical two-parameter family of compact scalar field black holes and compute numerically the shapes of some bound orbits. We find that a key feature of bound orbits around a compact black hole is that the angle between closest pericentre points is either negative or, at least, less than that for the Schwarzschild black hole of the same mass.
arXiv comment6 pages, 2 figures, presented at the 4th International Conference on Particle Physics and Astrophysics (ICPPA-2018)
References in corpus (8)
- BlackHoleCam: fundamental physics of the Galactic center
- Persistent Asymmetric Structure of Sagittarius A* on Event Horizon Scales
- Circular geodesics of naked singularities in the Kehagias-Sfetsos metric of Hořava's gravity
- Exact Black-Hole Solution With Self-Interacting Scalar Field
- Geodesic motion around traversable wormholes supported by a massless conformally-coupled scalar field
- On the trajectories of null and timelike geodesics in different wormhole geometries
- Spherically symmetric configurations of General Relativity in presence of scalar field: separation of test body circular orbits
- Selection criteria for two-parameter solutions to scalar-tensor gravity