We present results from two complementary tests of Lorentz invariance in electrodynamics. The first test is an even parity test, which compares two orthogonal cryogenic sapphire microwave oscillators rotating in the lab. We have now acquired over 1 year of data, allowing us to place independent limits on all eight ke and k0+ parameters. The second test is a rotating odd parity test, which compares the phase shift of two one-way propagating waves that experience different permeability over the length of propagation. A sensitive carrier suppression microwave interferometer is used to obtain highly sensitive phase comparison using a Mach-Zehnder configuration. This experiment is sensitive to the isotropic Lorentz violating parameter k tr, and is the first rotating experiment of this type with the first operation of this experiment seting a limit order SO-6 in a few weeks.
|Title of host publication||Proceedings of the 4th Meeting on CPT and Lorentz Symmetry, CPT 2007|
|Place of Publication||Bloomington, IN; United States|
|Number of pages||7|
|Publication status||Published - 2008|
|Event||Proceedings of the 4th Meeting on CPT and Lorentz Symmetry, CPT 2007 - Bloomington, IN; United States|
Duration: 8 Apr 2007 → 11 Apr 2007
|Conference||Proceedings of the 4th Meeting on CPT and Lorentz Symmetry, CPT 2007|
|Period||8/04/07 → 11/04/07|
Tobar, M. E. E., Stanwix, P. L. L., Miao, M. M. M., Ivanov, E. N. N., Fowler, A. C. C., Hartnett, J. G. G., Le Floch, J. M. M., & Wolf, P. (2008). Rotating experiments to test Lorentz invariance in the photon sector. In Proceedings of the 4th Meeting on CPT and Lorentz Symmetry, CPT 2007 (Vol. 1, pp. 16-22).