From classical to modern ether-drift experiments: the narrow window for a preferred frame

Abstract

Modern ether-drift experiments look for a preferred frame by measuring the difference Δνin the relative frequencies of two cavity-stabilized lasers, upon local rotations of the apparatus or under the Earth's rotation. If the small deviations observed in the classical ether-drift experiments were not mere instrumental artifacts, by replacing the high vacuum in the resonating cavities with a dielectric gaseous medium (e.g. air), the typical measured Δν\sim 1 Hz should increase by orders of magnitude. This prediction is consistent with the characteristic modulation of a few kHz observed in the original experiment with He-Ne masers. However, if such enhancement would not be confirmed by new and more precise data, the existence of a preferred frame can be definitely ruled out.

15 pages, Latex file

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• Momentum of electromagnetic fields, speed of light in moving media, and the photon mass
• A Criticism of "Gas Mode" Reinterpretations of the Michelson-Morley and Similar Experiments
• The Preferred System of Reference Reloaded
• Special Relativity in Absolute Space: from a contradiction in terms to an obviousness