Abstract
A search has been made for a preferred frame of reference in space. We assume that the velocityV of the earth in this frame is coupled to the spin of an electron through a termGV·σ. The sensing element was a bar magnet on a torsion fiber. By looking for diurnal variations in the orientation of the pendulum, we can set a limit on the strength of the coupling. We find that the two spin states are unlikely to be split by more than 7.2·10−28 erg. This refines previous limits by a factor of 80. No violation of Lorentz invariance was found.
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