On the variation of the gauge couplings during inflation

Details On the variation of the gauge couplings during inflation On the variation of the gauge couplings during inflation

2001-04-17

arxiv.org/abs/astro-ph/0104290v1

Phys.Rev. D64 (2001) 061301

Astronomy and Astrophysics

Astrophysics

5 pages in RevTex style, one figure

Scientific paper

10.1103/PhysRevD.64.061301

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 generated. Other possible implications of the model are outlined.

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