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Variation of the speed of light due to non-minimal coupling between electromagnetism and gravity

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arxiv gr-qc/0303081 v3 pith:NB264YIK submitted 2003-03-20 gr-qc

Pierre Teyssandier This is my paper · ORCID
classification gr-qc
keywords lightspeedvariationcouplingactionadditionconditionconsider
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abstract

We consider an Einstein-Maxwell action modified by the addition of three terms coupling the electromagnetic strength to the curvature tensor. The corresponding generalized Maxwell equations imply a variation of the speed of light in a vacuum. We determine this variation in Friedmann-Robertson-Walker spacetimes. We show that light propagates at a speed greater than $c$ when a simple condition is satisfied.

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  1. Revisiting Varying Speed of Light in Cosmology: Insights from the Friedmann-Lema\^itre-Robertson-Walker Metric

    physics.gen-ph 2025-05 reject novelty 2.0 of 10

    A varying speed of light in FLRW is presented as gauge freedom via the lapse function, but the key variational derivation omits the √-g measure and the claimed Hubble-tension resolution contradicts Eq. (30).

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