Abstract
A Friedman-like scenario is described in which due to the direct coupling of electromagnetic fields to spacetime curvature-the total number of photons comprised in the Universe at a given epoch changes as the Universe expands. The photon number distribution function, according to this scenario, acquires an explicit dependence on a non-vanishing chemical potential term which accounts for the occurrence of tidal effects in the interaction of photons (which, in a gravitational field, should not be treated as idealised, point-like objects) with gravity. The total amount of entropy observed today may be reviewed from a new perspective and ipso facto explained away.
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