Shadows near supermassive black holes: from a theoretical concept to GR test

Abstract

General relativity (GR) passed many astronomical tests but in majority of them GR predictions have been tested in a weak gravitational field approximation. Around 50 years ago a shadow has been introduced by J. Bardeen as a purely theoretical concept but due to an enormous progress in observational and computational facilities this theoretical prediction has been confirmed and the most solid argument for an existence of supermassive black holes in Sgr A* and M87* has been obtained.

12 pages, 1 figure, presented as a talk at The 6th International Conference on Particle Physics and Astrophysics (ICPPA-2022), accepted in IJMPD

References in corpus (14)

• 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
• First M87 Event Horizon Telescope Results. III. Data Processing and Calibration
• Detection of the Schwarzschild precession in the orbit of the star S2 near the Galactic centre massive black hole
• Gravitational Test Beyond the First Post-Newtonian Order with the Shadow of the M87 Black Hole
• Gravitational Lensing by Spinning Black Holes in Astrophysics, and in the Movie Interstellar
• Photon rings of spherically symmetric black holes and robust tests of non-Kerr metrics
• Orbital motion near Sagittarius A* -- Constraints from polarimetric ALMA observations
• Constraints on a tidal charge of the supermassive black hole in M87* with the EHT observations in April 2017
• Constraints on Yukawa gravity parameters from observations of bright stars
• Testing the Galactic Centre potential with S-stars
• Tests of gravity theories with Galactic Center observations
• Shadows around Sgr A* and M87* as a tool to test gravity theories
• Never bet against Einstein

Cited by in corpus (6)

• Analyzing the Influence of Geometrical Deformation on Photon Sphere and Shadow Radius: A New Analytical Approach -- Spherically Symmetric Spacetimes
• Multimodal signatures of asymptotic (A)dS Kalb-Ramond black holes: Constraints through the shadow, weak deflection angle, and topological photon spheres
• Testing black holes with cosmological constant in Einstein-bumblebee gravity through the black hole shadow using EHT data and deflection angle
• Charged Black Holes in the Kalb-Ramond Background with Lorentz Violation: Null Geodesics and Optical Appearance of a Thin Accretion Disk
• Shedding Light on Gravity: Black Hole Shadows and Lensing Signatures in Lorentz Gauge Theory
• Phenomenology of Schwarzschild-like Black Holes with a Generalized Compton Wavelength