Large-scale magnetic fields from inflation in teleparallel gravity

Abstract

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.

4 pages, no figure, to be published in the Proceedings of the "12th Asia Pacific Physics Conference."

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Cited by in corpus (4)

• Tensor perturbations of $f(T)$-branes
• Higgs inflation and teleparallel gravity
• The amplification of cosmological magnetic fields in Extended $f(T,B)$ Teleparallel Gravity
• Cosmological Issues in $F(T)$ Gravity Theory