# On the variation of the gauge couplings during inflation

@article{Giovannini2001OnTV, title={On the variation of the gauge couplings during inflation}, author={Massimo Giovannini}, journal={Physical Review D}, year={2001}, volume={64}, pages={061301} }

It is shown that the evolution of the (Abelian) gauge coupling during an inflationary phase of de Sitter type drives the growth of the two-point function of the magnetic inhomogeneities. After examining the constraints on the variation of the gauge coupling arising in a standard model of inflationary and post-inflationary evolution, magnetohydrodynamical equations are generalized to the case of time evolving gauge coupling. It is argued that large scale magnetic fields can be copiously… Expand

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