Shadows of Black Holes in Vector-Tensor Galileons Modified Gravity

Understand

We study the shadows of disformal black holes in vector-tensor Galileons modified gravity.

• Our analysis shows that the apparent image of the black hole in the observer's sky is non-spherical and cuspy, which is in contrast to the Kerr and Kerr-Newman cases.
• The non-trivial silhouette of the apparent image of the black hole provides novel templates for the current astrophysical observations.
• Moreover, due to the non-minimal coupling of the vector field to gravity the disformal black hole supports regular horizons for spin parameter exceeding the ADM mass.