Supernova, baryon acoustic oscillations, and CMB surface distance constraints on f(G) higher order gravity models

Understand

We consider recently proposed higher order gravity models where the action is built from the Einstein-Hilbert action plus a function f(G) of the Gauss-Bonnet invariant.

• The models were previously shown to pass physical acceptability conditions as well as solar system tests.
• In this paper, we compare the models to combined data sets of supernovae, baryon acoustic oscillations, and constraints from the CMB surface of last scattering.
• We find that the models provide fits to the data that are close to those of the LCDM concordance model.