Black hole shadow in symmergent gravity

Symmergent gravity is the R+R-2 gravity theory which emerges in a way restoring gauge symmetries broken explicitly by the ultraviolet cutoff in effective field theories. To test symmergent gravity we construct novel black hole solutions in four dimensions, and study their shadow in the vacuum as well as plasma medium. Our detailed analyses show that the horizon radius, Hawking temperature, Bekenstein-Hawking entropy, shadow angular radius, and photon deflection angle are sensitive probes of the symmergent gravity and particle spectrum of the underlying quantum field theory. (C) 2021 Elsevier B.V. All rights reserved.

Automated summary

Symmergent gravity is an emerging R+R-2 gravity theory that restores gauge symmetries broken explicitly by ultraviolet cutoff in effective field theories. Novel black hole solutions have been constructed to test symmergent gravity, and the results show that various indicators are sensitive probes of it and the particle spectrum of the underlying quantum field theory.