Tidal Disruption of Stars by Supermassive Black Holes and Naked Singularities with Scalar Hair
arXiv:2407.11535 · doi:10.1134/S1063778824020054
Abstract
In this paper we study tidal forces near strongly gravitating objects at the centers of galaxies. In our approach, dark matter surrounding the centers of galaxies is modeled by a nonlinear scalar field. We focus on static, asymptotically flat, spherically symmetric black holes and naked singularities supported by a real self-gravitating scalar field minimally coupled to gravity. We consider the influence of dark matter on the tidal forces caused by the central objects and some features of the motion of matter near these configurations. It turns out, first, that the event horizon radius of a scalar field black hole can be arbitrarily small as well as the radius of the innermost stable circular orbit, and tidal forces near this orbit can be very large. Second, we show that if strongly gravitating objects in the centers of galaxies are naked singularities, then bright flares (tidal disruption events) in the nuclei of galaxies can be explained in different way. In the vicinity of a scalar field naked singularity, baryonic matter is concentrated in the gravitational potential well forming a "gray shell" consisting of cold compressed matter. In this case, the flares are caused by the collisions of stars with this shell.
arXiv comment14 pages, 6 figures
References in corpus (33)
- LSST: from Science Drivers to Reference Design and Anticipated Data Products
- The Zwicky Transient Facility: System Overview, Performance, and First Results
- Tidal Disruption Events
- Gravitating Non-Abelian Solitons and Black Holes with Yang-Mills Fields
- Multiband lightcurves of tidal disruption events
- The mass distribution in the Galactic Centre from interferometric astrometry of multiple stellar orbits
- Shadows of spherically symmetric black holes and naked singularities
- Galactic Halos As Boson Stars
- No hair for spherical black holes: charged and nonminimally coupled scalar field with self--interaction
- Distinguishing black holes from naked singularities through their accretion disk properties
- Observing a wormhole
- Sgr A* and General Relativity
- Solutions of the Einstein equations for a black hole surrounded by a galactic halo
- Astrophysics of Wormholes
- An upper limit on the spin of SgrA based on stellar orbits in its vicinity
- Hinting a dark matter nature of Sgr A* via the S-stars
- A Cool Accretion Disk around the Galactic Centre Black Hole
- Exact Black-Hole Solution With Self-Interacting Scalar Field
- An elliptical accretion disk following the tidal disruption event AT 2020zso
- Fate of scalar dark matter solitons around supermassive galactic black holes
- Comparing timelike geodesics around a Kerr black hole and a boson star
- The Process of Stellar Tidal Disruption by Supermassive Black Holes. The first pericenter passage
- On the nature of dark matter
- Estimating the Parameters of Extended Gravity Theories with the Schwarzschild Precession of S2 Star
- Cosmological structure formation in scalar field dark matter with repulsive self-interaction: The Incredible Shrinking Jeans Mass
- Tidal Forces in Kottler Spacetimes
- Elliptical accretion disk as a model for tidal disruption events
- Bound orbits near scalar field naked singularities
- Tidal Forces in Naked Singularity Backgrounds
- Selection criteria for two-parameter solutions to scalar-tensor gravity
- Null and Timelike Geodesics Near the Throats of Phantom Scalar Field Wormholes
- Tidal effects in the motion of gas clouds around boson stars
- Tidal disruption near black holes and their mimickers