Abstract
The Mansouri-Sexl theory is a well known test theory of relativity, alongside with the Standard Model Extension it is the golden standard for testing the predictions of special relativity. Mansouri and Sexl dealt with the theory of the Michelson-Morley, Kennedy-Thorndike and Ives-Stilwell experiments but left out the very interesting Sagnac experiment. In this paper we present a novel experimental measurement of light speed anisotropy via the reenactment of the Sagnac experiment using ring laser gyroscopes (RLG) and we constrain the Mansouri-Sexl parameter ato less than 0.5±0.98⇥10 6. In a recent paper [1] we have shown how to use fiberoptics gyroscopes for constraining the parameter a, in the present paper we show how the ring laser gyroscopes are used for constraining light speed anisotropy in the framework of the Mansouri-
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