Quadratic curvature Gauss‐Bonnet gravity may be the solution to the dark energy problem, but a large coupling strength is required. This can lead to conflict with laboratory and planetary tests of Newton's law, as well as light bending. The corresponding constraints are derived. If applied directly to cosmological scales, the resulting bound on the density fraction is
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© 2007 American Institute of Physics.
2007
American Institute of Physics
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