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Physical Review Letters – 11 July 2003
Volume 91, Issue 2

Diagram of a modern high-precision Michelson-Morley experiment to test for variations in the speed of light with direction. The resonant frequencies of two cryogenic optical resonators (COREs) were compared over a period of more than a year; an anisotropy in c would cause the beat frequency to vary as the apparatus rotates with the Earth. [Holger Müller, Sven Herrmann, Claus Braxmaier, Stephan Schiller, and Achim Peters, Phys. Rev. Lett. 91, 020401 (2003)]

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