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New Limits on Local Lorentz Invariance in Mercury and Cesium

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arxiv 1205.5022 v1 pith:EXFG4IJB submitted 2012-05-22 physics.atom-ph

New Limits on Local Lorentz Invariance in Mercury and Cesium

S. K. Peck , D. K. Kim , D. Stein , D. Orbaker , A. Foss , M. T. Hummon , L. R. Hunter This is my paper
classification physics.atom-ph
keywords boundsdirectionestablishedinvariancelimitslocallorentzamplitudes
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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.

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