Alessandro Retino, Alessandro D. A. M. Spallicci
We use spacecraft data in the solar wind at 1 AU to provide an estimate of the upper limit of the de Broglie-Proca's massive photon, by looking for deviations from the classical Ampere's law. We take advantage of the Cluster spacecraft which allow the direct computation of curl B from simultaneous four-point measurements of the magnetic field. We estimate the upper bound for the mass of the de Broglie-Proca's photon to be 2 x 10^(-53) kg, in agreement with previous findings based on ad hoc models in the solar wind.
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http://arxiv.org/abs/1302.6168
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