Solar system constraints on Gauss-Bonnet mediated dark energy
Although the Gauss-Bonnet term is a topological invariant for general relativity, it couples naturally to a quintessence scalar field, modifying gravity at solar system scales. We determine the solar system constraints due to this term by evaluating the post-Newtonian metric for a distributional sou...
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| Main Authors: | , , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
5 October 2007
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| In: |
Journal of cosmology and astroparticle physics
Year: 2007, Issue: 10, Pages: 1-13 |
| ISSN: | 1475-7516 |
| DOI: | 10.1088/1475-7516/2007/10/004 |
| Online Access: | Verlag, Volltext: http://dx.doi.org/10.1088/1475-7516/2007/10/004 Verlag, Volltext: http://stacks.iop.org/1475-7516/2007/i=10/a=004 
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| Author Notes: | Luca Amendola, Christos Charmousis and Stephen C. Davis |
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| 520 | |a Although the Gauss-Bonnet term is a topological invariant for general relativity, it couples naturally to a quintessence scalar field, modifying gravity at solar system scales. We determine the solar system constraints due to this term by evaluating the post-Newtonian metric for a distributional source. We find a mass-dependent, 1/ r 7 correction to the Newtonian potential, and also deviations from the Einstein gravity prediction for light-bending. We constrain the parameters of the theory using planetary orbits, the Cassini spacecraft data, and a laboratory test of Newton's law, always finding extremely tight bounds on the energy associated to the Gauss-Bonnet term. We discuss the relevance of these constraints to late-time cosmological acceleration. | ||
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