Abstract
IMPROVEMENTS in the precision and stability of caesium beam clocks have enabled searches to be made for very small changes in the rate of a clock under the influence of various physical phenomena. Three known effects can change the frequency of a wave: the Doppler effect (radial and transverse), the gravitational redshift and a change of the optical path with time1. If any other effects exist, their discovery would be of great importance to astrophysics, for so much significance attaches to the interpretation of redshifts of lines from distant galaxies.
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References
Sadeh, D., Knowles, S. H., and Yaplee, B. S., Science, 159, 307 (1968).
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Sadeh, D., Hollinger, J. P., Knowles, S. H., and Youmans, A. B., Science 162, 897 (1968).
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SADEH, D., AU, B. Daily Variations of the Frequency of a Very Accurate Radio Frequency. Nature 224, 1291–1293 (1969). https://doi.org/10.1038/2241291a0
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DOI: https://doi.org/10.1038/2241291a0
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