Tests of $\Lambda$CDM and Conformal Gravity using GRB and Quasars as Standard Candles out to $z \sim 8$

Understand

We compare the cosmology of conformal gravity (CG), (Mannheim 2006), to $\Lambda$CDM.

• CG cosmology has repulsive matter and radiation on cosmological scales, while retaining attractive gravity at local scales.
• Mannheim (2003) finds that CG agrees with $\Lambda$CDM for supernova data at redshifts $z<1$.
• We use GRBs and quasars as standard candles to contrast these models in the redshift range $0<z<8$.