用多波长天体测量约束新的基础物理学
Constraining new fundamental physics with multiwavelength astrometry
摘要：
虽然光的偏转在广义相对论中是消色差的，但在一些新物理模型中并不总是如此（例如某些量子引力和弦启发模型，具有非最小光子引力耦合或具有大质量光子的模型等）。我们讨论了这些模型的参数可能会受到不同波长的精密天体测量。从已发表的引力透镜MG J2016+112的观测结果中，我们获得了世界上最好的光的色引力偏转极限（以及与距离尺度>Mpc相关的光子质量的唯一极限）。我们还概述了进一步改善这些限制的前景。
英文摘要：
While the deflection of light is achromatic in General Relativity, it is not always so in several new-physics models (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. From published observations of the gravitational lens MG J2016+112, we obtain world-best limits on chromatic gravitational deflection of light (and the unique limit on the photon mass relevant for distance scales >Mpc). We also outline prospects for further improvement of these limits.
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