Mathematics – Logic
Scientific paper
Jan 1973
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1973natur.241..109c&link_type=abstract
Nature, Volume 241, Issue 5385, pp. 109 (1973).
Mathematics
Logic
5
Scientific paper
IN a recent letter1 Pecker et al. discussed the possibility that a part of the ``cosmological'' redshift could result from the interaction of photons with an interstellar radiation field. Although this suggestion is old2,3, it has recently regained prominence with the discovery of the 3 K blackbody radiation. Pecker et al. discussed a formula for the energy loss of the propagating photon, v 1, where Δ(v 2) is the coupling constant between the propagating photon and the radiation field of frequency v 2, n 2 is the number density (cm-3) of the photons at v 2, and δl is the length of the interaction path, in cm. Assuming that Δ(v 2) is independent of v 2, they suggested an experiment to determine an upper limit for its value. The proposed experiment, measuring by the Mössbauer effect the energy loss of gamma rays traversing a laser beam, is very difficult to perform. But another Mössbauer experiment was performed a number of years ago to test just this question. In that experiment4, gamma rays were propagated through a microwave cavity filled with photons of 9,234 MHz (λ~3 cm) radiation; the fractional energy shift of the gamma rays due to the microwave field was found to be 0.4+/-6.0×10-16, corresponding to a value of Δ(v 2)<10-33 cm-1. This limit is far smaller than the value Δ(v 2)~10-30 cm-1 proposed in ref. 1 from the analysis of solar redshift data.
Cohen Ralph L.
Wertheim G. K.
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