https://doi.org/10.1140/epjc/s10052-015-3352-6
Regular Article - Theoretical Physics
Modified gravity black holes and their observable shadows
1
Perimeter Institute for Theoretical Physics, Waterloo, ON, N2L 2Y5, Canada
2
Department of Physics and Astronomy, University of Waterloo, Waterloo, ON, N2L 3G1, Canada
* e-mail: jmoffat@perimeterinstitute.ca
Received:
11
February
2015
Accepted:
9
March
2015
Published online:
20
March
2015
The shadows cast by non-rotating and rotating modified gravity black holes are determined by the two parameters mass 
and angular momentum 
. The sizes of the shadows cast by the spherically symmetric static modified gravity–Schwarzschild and modified gravity–Kerr rotating black holes increase significantly as the free parameter 
is increased from zero. The Event Horizon Telescope shadow image measurements can determine whether Einstein’s general relativity is correct or whether it should be modified in the presence of strong gravitational fields.
© SIF and Springer-Verlag Berlin Heidelberg, 2015
