Test of Lorentz Invariance in Electrodynamics Using Rotating Cryogenic Sapphire Microwave Oscillators

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Abstract
We present the first results from a rotating Michelson-Morley experiment that uses two orthogonally orientated cryogenic sapphire resonator-oscillators operating in whispering gallery modes near 10 GHz. The experiment is used to test for violations of Lorentz Invariance in the frame-work of the photon sector of the Standard Model Extension (SME), as well as the isotropy term of the Robertson-Mansouri-Sexl (RMS) framework. In the SME we set a new bound on the previously unmeasured kappa_{e-}^{ZZ} component of 2.1(5.7)x10^{-14}, and set more stringent bounds by up to a factor of 7 on seven other components. In the RMS a more stringent bound of -2.6(2.1)x10^{-10} on the isotropy parameter, P_{MM}= delta - beta + 1/2 is set, which is a factor of 7 improvement.

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