An experiment aimed at detecting a DC voltage across a conductor induced by the steady magnetic field of a coil, carried out in 1998, provided a positive (although preliminary) evidence for such an effect, which might be interpreted as a breakdown of local Lorentz invariance. We repeated in 1999 the same experiment with a different experimental apparatus and a sensitivity improved by two orders of magnitude. The results obtained are discussed here in detail. They confirm the findings of the previous experiment, and show, among the others, that the effect is independent of the direction of the current. A possible interpretation of the results is given in terms of a geometric description of the gravitational and the electromagnetic interactions by means of phenomenological, energy-dependent metrics.
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Cardone, F., Mignani, R. & Scrimaglio, R. New Experimental Results on the Lower Limits of Local Lorentz Invariance. Found Phys 36, 263–290 (2006). https://doi.org/10.1007/s10701-005-9014-z
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DOI: https://doi.org/10.1007/s10701-005-9014-z