Sumanta Chakraborty, Soumitra Sengupta
Perihelion precession of planetary orbits and bending angle of null geodesics are estimated near a charged dilaton spacetime 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 envisaged as an indicator of a dominant stringy effects over the curvature effects. The dependance of the perihelion precession and bending angle with various parameters are estimated.
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http://arxiv.org/abs/1208.1433
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