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 this paper, we investigate the topological numbers for the singly rotating Kerr black holes
in all dimensions and the four-dimensional Kerr-Newman black hole. We show that for …

The nearby radio galaxy M87 is a prime target for studying black hole accretion and jet
formation,. Event Horizon Telescope observations of M87 in 2017, at a wavelength of 1.3 …

The star S2 orbiting the compact radio source Sgr A* is a precision probe of the gravitational
field around the closest massive black hole (candidate). Over the last 2.7 decades we have …

A complete theory of gravity impels us to go beyond Einstein's general relativity. One
promising approach lies in a new class of teleparallel theory of gravity named f (Q), where …

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 …

Astronomical observations reveal a major deficiency in our understanding of physics—the
detectable mass is insufficient to explain the observed motions in a huge variety of systems …

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 …

We present the results of nine simulations of radiatively inefficient magnetically arrested
discs (MADs) across different values of the black hole spin parameter a*:− 0.9,− 0.7,− 0.5 …

The nearby radio galaxy M87 offers a unique opportunity to explore the connections
between the central supermassive black hole and relativistic jets. Previous studies of the …