Comment on "Problems with Mannheim's conformal gravity program"

TL;DR

This paper critiques Yoon's claims about issues in Mannheim's conformal gravity, demonstrating that their conclusions are based on an invalid assumption that breaks the theory's conformal invariance.

Contribution

It clarifies that Yoon's problems with conformal gravity arise from an assumption that contradicts the theory's fundamental symmetry, invalidating their results.

Findings

Yoon's assumptions violate conformal invariance

Yoon's conclusions are invalidated

The non-relativistic limit remains consistent with conformal gravity

Abstract

Recently in Phys. Rev. D 88, 027504 (2013) Yoon has suggested that there may be problems for the non-relativistic limit of the conformal gravity theory. Here we show that Yoon's results only hold because of the assumption that gravitational sources can be treated the same way that they are treated in standard Newton-Einstein gravity. Since such an assumption violates the theory's underlying conformal invariance,Yoon's conclusions are invalidated.