Black Hole Shadow in Symmergent Gravity

TL;DR

This paper explores black hole shadows within symmergent gravity, an $R+R^2$ theory emerging from quantum field considerations, analyzing observable effects like shadow size and photon deflection to test the theory.

Contribution

It introduces novel four-dimensional black hole solutions in symmergent gravity and investigates their shadows and related phenomena as potential observational probes.

Findings

Shadow size and photon deflection are sensitive to symmergent gravity parameters.

Horizon radius and temperature vary with underlying quantum field spectrum.

Black hole thermodynamic properties are affected by the symmergent gravity framework.

Abstract

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.