Observation of the supermassive black holes and wormholes with space-ground VLBI with «Millimetron»

Supermassive objects at the centers of nearby galaxies provide an excellent opportunity to test the general theory of relativity. Observing the shadows of these objects can help differentiate between models of a supermassive black hole and a wormhole as the central object. Additionally, such observations can yield precise measurements of key parameters of the spacetime metric in the case of a black hole, specifically its spin and mass. The “Millimetron” project, led by the Astro-Space Center of the Lebedev Physical Institute (ASC LPI), aims to capture high-resolution images of the shadows of central supermassive objects, while also investigating the fine structure of these shadows, including photon rings (lensed images of the accretion disk formed by light rays that complete multiple orbits around the central massive object) in several dozen nearby galaxies.