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

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

2003-03-20

arxiv.org/abs/gr-qc/0303081v3

Annales Fond.Broglie 29 (2004) 173

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

Invited lecture given at the Meeting on Electromagnetism organized by the Fondation Louis de Broglie in Peyresq, September 2-7

Scientific paper

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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