Rotation Generated in Vacuum by a Magnetic Field ”
نویسنده
چکیده
In a recent letter [1] the PVLAS collaboration reported the observation of optical rotation induced in vacuum by an external magnetic field. More recently [2] the same group reported also the observation of vaccuum birefringence under similar conditions. In this comment I wish to point out that the reported results are excluded at the 95% confidence level by a previous experiment [3] carried out by the BRFT collaboration (Brookhaven, Rochester, Fermilab, Trieste). In Table 1 we summarize the relevant parameters of the two experiments.
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