Singularities in massive conformal gravity

TL;DR

This paper investigates how big bang and black hole singularities affect massive conformal gravity, finding that these singularities do not cause divergences in the theory's effective action, thus are harmless.

Contribution

It demonstrates that in massive conformal gravity, singularities do not lead to divergences in the effective action, suggesting they are physically benign.

Findings

Singularities do not diverge in the effective action of MCG.

Big bang and black hole singularities are harmless in this theory.

Massive conformal gravity remains well-behaved at singularities.

Abstract

We study the quantum effects of big bang and black hole singularities on massive conformal gravity. We do this by analyzing the behavior of the on-shell effective action of the theory at these singularities. The result is that such singularities are harmless in MCG because the on-shell effective action of the theory does not diverge at them.