P. Egorov, M. Guzinin, H. Hakopyan, S. Troitsky
While the deflection of light is achromatic in General Relativity, it is not always so in certain new-physics models. These include modifications of the Einstein gravity (e.g. certain quantum-gravity and string-inspired models), models with nonminimal photon-gravity coupling or with massive photon etc. We discuss how parameters of these models may be constrained by precise astrometry at different wavelenghts, present world-best limits on chromatic gravitational deflection of light (and the unique limit on the photon mass relevant for distance scales >Mpc) and outline prospects for their further improvement.
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http://arxiv.org/abs/1306.2716
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