In this article, we provide a review of the current state of the research of the black hole
shadow, focusing on analytical (as opposed to numerical and observational) studies. We …

In recent years, unprecedented progress has been achieved regarding black holes'
observation through the electromagnetic channel. The images of the supermassive black …

Horizon-scale images of black holes (BHs) and their shadows have opened an
unprecedented window onto tests of gravity and fundamental physics in the strong-field …

Ultralight bosons can affect the dynamics of spinning black holes (BHs) via superradiant
instability, which can lead to a time evolution of the supermassive BH shadow. We study …

We report on the polarized light curves of the Galactic Center supermassive black hole
Sagittarius A*, obtained at millimeter wavelength with the Atacama Large Millimeter …

Black hole (BH) shadows can be used to probe new physics in the form of ultralight particles
via the phenomenon of superradiant instability. By directly affecting the BH mass and spin …

Non-linear interaction between the electromagnetic fields (EMF) occurs when vacuum
polarization in quantum electrodynamics (QED) happens. The field of non-linear …

Abstract Event Horizon Telescope (EHT) observations have revealed a bright ring of
emission around the supermassive black hole at the center of the M87 galaxy. EHT images …

Simulated images of a black hole surrounded by optically thin emission typically display two
main features: a central brightness depression and a narrow" photon ring" consisting of …

The bumblebee gravity model, with a vector field nonminimally coupled to gravity, is a
natural extension of the Einstein-Maxwell theory. In this theory, a black hole can carry a …