Using Microwave Cavities to Test Lorentz Invariance

Stephen R. Parker, Paul L. Stanwix, Eugene N. Ivanov, Michael E. Tobar, M. Nagel, E.V. Kovalchuk, A Peters

Research output: Chapter in Book/Conference paperConference paperpeer-review


A cryogenic sapphire oscillator1,2(CSO) exploits the low loss propertiesof sapphire at cryogenic temperatures to generate microwave signals withshort term fractional frequency stability below 10−15. If two CSOs arealigned orthogonally the beat frequency between the oscillators can beused to search for orientation dependent deviations in the speed of light.The sensitivity of such an experiment is dictated by the stability of thebeat frequency. Active rotation of the experiment can increase the effectivesensitivity although it can also induce extra systematic noise. Microwaveoscillators have been used in some of the most sensitive tests of Lorentzinvariance3,4and we will provide a brief outline of the design and principlesbehind such an experiment APA (American Psychological Assoc.) Kostelecký, V. A. (2014). Cpt And Lorentz Symmetry - Proceedings Of The Sixth Meeting. Hackensack, NJ: World Scientific. MLA (Modern Language Assoc.) Kostelecký, V. Alan. Cpt and Lorentz Symmetry - Proceedings of the Sixth Meeting. World Scientific, 2014. EBSCOhost.
Original languageEnglish
Title of host publicationProceedings of the 6th Meeting on CPT and Lorentz Symmetry
EditorsV. Alan Kostelecký
PublisherWorld Scientific Publishing
Number of pages4
ISBN (Electronic)9789814566421
Publication statusPublished - 2013
Event6th Meeting on CPT and Lorentz Symmetry - Bloomington, United States
Duration: 17 Jun 201321 Jun 2013


Conference6th Meeting on CPT and Lorentz Symmetry
Country/TerritoryUnited States


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