Sumanta Chakraborty, Soumitra Sengupta
Perihelion precession of planetary orbits and bending angle of null geodesics are estimated for different gravity theories in string inspired models. It is shown that for dilaton coupled gravity, the leading order measure in the angle of bending of light comes purely from vaccum expectation value of the dilaton field which may be interpreted as an indicator of a dominant stringy effect over the curvature effect. We arrive at similar results for spherically symmetric solution in quadratic gravity. We also present the perihelion shift and bending of light in Einstein-Maxwell-Gauss-Bonnet theory. A numerical bound to different coupling parameters in these models are estimated.
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http://arxiv.org/abs/1208.1433
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