Abstract
The crucial problem of how to synchronize clocks and measure the one-way speed of light was originally discussed by Poincare and Einstein. After being neglected for many decades, the Poincare-Einstein problem of synchronization revived in 1977 with the work of Mansouri and Sexl, by which the one-way speed remains undetermined, allowing for unequal values of the speed of light in opposite directions. We review this problem in the framework of relativistic theories that assume clock-retardation and rod-contraction. We show that, for preferred frame theories, convection or “open” currents yield a magnetic field that depends on the velocity v with respect to the preferred frame S o . We also outline an experiment, based on Faraday’s law of induction, that can determine the velocity v, identify S o , and test special relativity versus preferred frame theories. This result resolves the Poincare-Einstein problem and shows that, in principle, the one-way speed c can be measured.
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