Electromagnetic Waves in an Expanding Universe

Details Electromagnetic Waves in an Expanding Universe Electromagnetic Waves in an Expanding Universe

Dec 1973

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1973phrvd...8.4297m&link_type=abstract

Physical Review D, vol. 8, Issue 12, pp. 4297-4302

Physics

37

Scientific paper

The electromagnetic perturbation equations are solved in a closed Robertson-Walker space-time; the frequency spectrum and the proper modes are found. A simple quantum theory of electromagnetic waves in the background metric is then developed using the proper modes of the static metric conformally connected with the closed Robertson-Walker metric. It is shown that the number of "photons" does not change as a result of expansion (or contraction). The application of these results to the cosmic background radiation is discussed.

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