Speaker
Hanna Liis Tamm
(University of Tartu)
Description
The increased precision of horizon-scale imaging achieved by interferometric instruments motivates a closer examination of the shadow of the black hole (BH) and its constraints on the geometry in the center of Sgr A$^\ast$. While these have been applied to solutions in general relativity (GR) and in its metric modifications, we investigate the shadow sizes set by various non-Riemannian theories of gravity, namely in the framework of metric-affine, teleparallel, Ricci-based and Palatini theories, incorporating the effects of nonlinear electrodynamics (NLED). Our analysis sets constraints on theories capable of mimicking BHs in GR and allows for the exclusion of some solutions.
Authors
Hanna Liis Tamm
(University of Tartu)
Dr
Laur Järv
(University of Tartu)
Merce Guerrero
(University of Tartu)