Pulsar Test of a Variation of the Speed of Light with Frequency
- 14 November 1969
- journal article
- other
- Published by American Association for the Advancement of Science (AAAS) in Science
- Vol. 166 (3907), 879-881
- https://doi.org/10.1126/science.166.3907.879
Abstract
The sharply defined optical and radio pulses from pulsars make possible a test of the variation of the speed of light with frequency, and of the possible existence of a photon mass. The data indicate that the mass of a real photon is less than 10-44 gram. Detection of extragalactic pulsars could allow a substantial improvement of this limit.Keywords
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