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We discuss an extended version of electromagnetism in which the usual gaugefixing term is promoted into a physical contribution that introduces a newscalar state in the theory. This new state can be generated from vacuum quantumfluctuations during an inflationary era and, on super-Hubble scales, gives riseto an effective cosmological constant. The value of such a cosmologicalconstant coincides with the one inferred from observations as long as inflationtook place at the electroweak scale. On the other hand, the new state alsogenerates an effective electric charge density on sub-Hubble scales thatproduces both vorticity and magnetic fields with coherent lengths as large asthe present Hubble horizon.

Cosmic magnetic fields and dark energy in extended electromagnetism