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

Paul L. Stanwix·Michael E. Tobar·Peter Wolf·Mohamad Susli·Clayton R. Locke·Eugene N. Ivanov·John Winterflood·Frank van Kann
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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 $\tildeκ_{e-}^{ZZ}$ component of $2.1(5.7)\times10^{-14}$, and set more stringent bounds by up to a factor of 7 on seven other components. In the RMS a more stringent bound of $-0.9(2.0)\times 10^{-10}$ on the isotropy parameter, $P_{MM}=δ- β+ {1/2}$ is set, which is more than a factor of 7 improvement. More detailed description of the experiment and calculations can be found in: hep-ph/0506200

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Paul L. Stanwix, Michael E. Tobar, Peter Wolf, Mohamad Susli, Clayton R. Locke, Eugene N. Ivanov, John Winterflood, Frank van Kann. 2005-07-21. Test of Lorentz Invariance in Electrodynamics Using Rotating Cryogenic Sapphire Microwave Oscillators. https://doi.org/10.1103/physrevlett.95.040404

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