Limits on Violations of Lorentz Symmetry and the Einstein Equivalence Principle using RadioFrequency Spectroscopy of Atomic Dysprosium
Abstract
We report a joint test of local Lorentz invariance and the Einstein equivalence principle for electrons, using longterm measurements of the transition frequency between two nearly degenerate states of atomic dysprosium. We present manybody calculations which demonstrate that the energy splitting of these states is particularly sensitive to violations of both special and general relativity. We limit Lorentz violation for electrons at the level of 10^{17}, matching or improving the best laboratory and astrophysical limits by up to a factor of 10, and improve bounds on gravitational redshift anomalies for electrons by 2 orders of magnitude, to 10^{8}. With some enhancements, our experiment may be sensitive to Lorentz violation at the level of 9×10^{20}.
 Publication:

Physical Review Letters
 Pub Date:
 August 2013
 DOI:
 10.1103/PhysRevLett.111.050401
 arXiv:
 arXiv:1303.2747
 Bibcode:
 2013PhRvL.111e0401H
 Keywords:

 03.30.+p;
 04.80.y;
 11.30.Cp;
 32.30.Jc;
 Special relativity;
 Experimental studies of gravity;
 Lorentz and Poincare invariance;
 Visible and ultraviolet spectra;
 High Energy Physics  Phenomenology;
 General Relativity and Quantum Cosmology;
 Physics  Atomic Physics
 EPrint:
 Updated to match published version