Experimental Tests on Yang-Mills Gravity with Accurate Measurements of the Deflection of Light

In the geometric-optics limit, Yang-Mills gravity with space-time translational gauge symmetry predicts $\text{D}\varphi =7Gm\mathrm{/}(2R)\approx {1.53}^{\mathrm{\prime }\mathrm{\prime }}$ for the deflection of a light ray by the sun. The result, which is about 12% smaller than that in the conventional theory, is consistent with experiments involving optical frequencies that had an accuracy of 10-20%.