RUDN astrophysicists have proposed a new method for approximate calculation of the parameters of spherically symmetric black holes in the Einstein-Maxwell theory. By comparing the shadow radii of the black holes obtained via this method with exact numerical solutions, astrophysicists have revealed that the approximation they suggested shows a reasonable accuracy in the second order. This means that it is possible to study the black holes themselves and the phenomena in their vicinity, for example, particle motion. The article is published in the journal Physical Review D.
Source:
https://phys.org/news/2020-01-astrophysicists-approximations-metric-spherically-symmetric.html