Table of Contents
Symmetry, Volume 9, Issue 10 (October 2017)
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Cover Story (view full-size image) Lorentz symmetry asserts that the vacuum has no special directions, and therefore clocks tick at [...] Read more. Lorentz symmetry asserts that the vacuum has no special directions, and therefore clocks tick at the same rate no matter their orientation. If Lorentz symmetry is violated, however, then the frequency of clocks could depend on their orientation. This Lorentz violation may sometimes be represented as a uniform vector field. As Earth rotates, an atomic clock on its surface may then speed up and slow down as the angle between its quantization axis and the background vector field changes. We describe tests of Lorentz violation that have been performed in high-precision experiments with sensitive atomic clocks. View this paper