Primordial magnetic fields and nonlinear electrodynamics

Details Primordial magnetic fields and nonlinear electrodynamics Primordial magnetic fields and nonlinear electrodynamics

2007-10-12

arxiv.org/abs/0710.2435v1

Phys.Rev.D77:023530,2008

Astronomy and Astrophysics

Astrophysics

21 pages, 3 figures

Scientific paper

10.1103/PhysRevD.77.023530

The creation of large scale magnetic fields is studied in an inflationary universe where electrodynamics is assumed to be nonlinear. After inflation ends electrodynamics becomes linear and thus the description of reheating and the subsequent radiation dominated stage are unaltered. The nonlinear regime of electrodynamics is described by lagrangians having a power law dependence on one of the invariants of the electromagnetic field. It is found that there is a range of parameters for which primordial magnetic fields of cosmologically interesting strengths can be created.

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