Consider a signal generator whose instantaneous time averages implied in the definitions are normally not available; output voltage V(t) may be written as thus estimates for the two measures must be used. Estimates of
We present a new measurement constraining Lorentz and CPT violation of the proton using a hydrogen maser double resonance technique. A search for hydrogen Zeeman frequency variations with a period of the sidereal day (23.93 h) sets a clean limit on violation of Lorentz and CPT symmetry of the proton at the 10 −27 GeV level.
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