Broken symmetry can yield a positive effective G in conformal gravity
arXiv:1504.02702
Abstract
We modify the action of Mannheim's conformally invariant model by changing the sign of two coefficients. This breaks conformal symmetry, but results in a cosmology that has a positive effective G and at the same time retains one of the main advantages of the Mannheim model, a possible solution of the cosmological constant problem.
arXiv comment4 pages, no figures