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Modern ether-drift experiments in vacuum could in principle detect the tinyrefractive index that, in a flat-space picture of gravity, is appropriate foran apparatus placed on the Earth's surface. In this picture, in fact, if therewere a preferred reference frame, light on the Earth would exhibit a slightanisotropy with definite quantitative differences from General Relativity. Byre-analyzing the data published by two modern experiments with rotating opticalresonators, and concentrating on the part of the signal that should be free ofspurious systematic effects, we have found evidences that would support theflat-space scenario.

Flat-space picture of gravity vs. General Relativity: a precision test for present ether-drift experiments