Abstract
FOLLOWING renewed interest in the possible existence of a finite photon rest mass, Goldhaber and Nieto1 have presented an excellent review of the general methods which have been adopted in an attempt to establish an upper limit for this rest mass. At present the lowest upper limit obtained experimentally is µ0≤4×10−48 g (ref. 2), involving magnetic anomalies in the geomagnetic field. Suggestions have also been made1 on methods whereby an improved upper limit to µ0 may be determined. We present here a novel method for pursuing this goal based on a departure from the conventional Doppler shift for photons.
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