• DOI:10.1103/PhysRevD.74.081101
• Corpus ID: 3222284

Improved test of Lorentz invariance in electrodynamics using rotating cryogenic sapphire oscillators

@article{Stanwix2006ImprovedTO,
  title={Improved test of Lorentz invariance in electrodynamics using rotating cryogenic sapphire oscillators},
  author={Paul L. Stanwix and Michael E. Tobar and Peter Wolf and Clayton R. Locke and Eugene N. Ivanov},
  journal={Physical Review D},
  year={2006},
  volume={74},
  pages={081101}
}

• P. Stanwix, M. Tobar, +2 authors E. Ivanov
• Published 19 September 2006
• Physics
• Physical Review D

We present new results from our test of Lorentz invariance, which compares two orthogonal cryogenic sapphire microwave oscillators rotating in the lab. We have now acquired over 1 year of data, allowing us to avoid the short data set approximation (less than 1 year) that assumes no cancellation occurs between the {kappa}-tilde{sub e-} and {kappa}-tilde{sub o+} parameters from the photon sector of the standard model extension. Thus, we are able to place independent limits on all eight {kappa}-tilde{sub e-} and {kappa}-tilde{sub o+} parameters. Our result represents up to a factor of 10 improvement over previous nonrotating measurements (which independently constrained seven parameters) and is a slight improvement (except for {kappa}-tilde{sub e-}{sup ZZ}) over results from previous rotating experiments that assumed the short data set approximation. Also, an analysis in the Robertson-Mansouri-Sexl framework allows us to place a new limit on the isotropy parameter P{sub MM}={delta}-{beta}+(1/2) of 9.4(8.1)x10{sup -11}, an improvement of a factor of 2.