1. New Limits on Local Lorentz Invariance in Mercury and Cesium
- Author
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Peck, S. K., Kim, D. K., Stein, D., Orbaker, D., Foss, A., Hummon, M. T., and Hunter, L. R.
- Subjects
Physics - Atomic Physics - Abstract
We report new bounds on Local Lorentz Invariance (LLI) violation in Cs and Hg. The limits are obtained through the observation of the the spin- precession frequencies of 199Hg and 133Cs atoms in their ground states as a function of the orientation of an applied magnetic field with respect to the fixed stars. We measure the amplitudes of the dipole couplings to a preferred direction in the equatorial plane to be 19(11) nHz for Hg and 9(5) microHz for Cs. The upper bounds established here improve upon previous bounds by about a factor of four. The improvement is primarily due to mounting the apparatus on a rotating table. New bounds are established on several terms in the standard model extension including the first bounds on the spin-couplings of the neutron and proton to the z direction, <7e-30 GeV and <7e-29 GeV, respectively., Comment: 17 pages, 6 figures
- Published
- 2012
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