Solar system constraints on f(G) gravity models
  We discuss solar system constraints on f(G) gravity models, where f is a
function of the Gauss-Bonnet term G. We focus on cosmologically viable f(G)
models that can be responsible for late-time cosmic acceleration. These models
generally give rise to corrections of the form epsilon*(r/rs)^p to the vacuum
Schwarzschild solution, where epsilon = H^2 rs^2 << 1, rs is the Schwarzschild
radius of Sun, and H is the Hubble parameter today. We generally estimate the
strength of modifications to General Relativity in order to confront models
with a number of experiments such as the deflection of light and the perihelion
shift. We show that cosmologically viable f(G) models can be consistent with
solar system constraints for a wide range of model parameters.
