New Limits on Local Lorentz Invariance in Mercury and Cesium
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.
Keywords
Cite
@article{arxiv.1205.5022,
title = {New Limits on Local Lorentz Invariance in Mercury and Cesium},
author = {S. K. Peck and D. K. Kim and D. Stein and D. Orbaker and A. Foss and M. T. Hummon and L. R. Hunter},
journal= {arXiv preprint arXiv:1205.5022},
year = {2015}
}
Comments
17 pages, 6 figures