Abstract
A Tolman-like Scenario is described in which due to the direct coupling of electromagnetic fields to space-time curvature, the total number of photons comprised in the universe at a given epoch changes as the Universe expands.
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References
Novello, M.: 1987,The program of an Eternal Universe, 5th Brazilian School of Cosmology and Gravitation, p. 215.
Tolman, R.C.: 1934,Proc. Nat. Acad. Sci. 20, 169.
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Tomimura, N., Nogales, J.A.C. The number of photons for tolman-type metric. Astrophys Space Sci 208, 313–318 (1993). https://doi.org/10.1007/BF00657946
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DOI: https://doi.org/10.1007/BF00657946