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 …

We give a brief review on the formation and the calculation of black hole shadows. Firstly,
we introduce the concept of a black hole shadow and the current works on a variety of black …

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 …

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 electrodynamics (NLED) theories are well-motivated extensions of QED in the
strong field regime, and have long been studied in the search for regular black hole (BH) …

The Event Horizon Telescope has recently provided the first image of the dark shadow
around the supermassive black hole M87*. The observation of a highly circular shadow …

Searching for violations of the no-hair theorem (NHT) is a powerful way to test gravity, and
more generally fundamental physics, particularly with regards to the existence of additional …

Thanks to the release of the extraordinary EHT image of shadow attributed to the M87*
supermassive black hole (SMBH), we have a novel window to assess the validity of …

Abstract The Event Horizon Telescope (EHT), a global submillimeter wavelength very long
baseline interferometry array, unveiled event-horizon–scale images of the supermassive …