Tuesday, July 30, 2013

1307.7448 (Kazuharu Bamba et al.)

Large-scale magnetic fields from inflation in teleparallel gravity    [PDF]

Kazuharu Bamba, Chao-Qiang Geng, Ling-Wei Luo
Generation of large-scale magnetic fields in inflationary cosmology is studied in teleparallelism, where instead of the scalar curvature in general relativity, the torsion scalar describes the gravity theory. In particular, we investigate a coupling of the electromagnetic field to the torsion scalar during inflation, which leads to the breaking of conformal invariance of the electromagnetic field. We demonstrate that for a power-law type coupling, the current magnetic field strength of $\sim 10^{-9}$ G on 1 Mpc scale can be generated, if the backreaction effects and strong coupling problem are not taken into consideration.
View original: http://arxiv.org/abs/1307.7448

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