Generation of large-scale magnetic fields from inflation in teleparallelism

We explore the generation of large-scale magnetic fields from inflation in teleparallelism, in which the gravitational theory is described by the torsion scalar instead of the scalar curvature in general relativity. In particular, we examine the case that the conformal invariance of the electromagne...

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Bibliographic Details
Published in:arXiv.org 2012-09
Main Authors: Bamba, Kazuharu, Chao-Qiang Geng, Ling-Wei, Luo
Format: Article
Language:English
Subjects:
Coupling
Curvature
Electromagnetic fields
Electromagnetism
Gravitation theory
Magnetic fields
Relativity
Torsion
Online Access:Get full text
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Summary:We explore the generation of large-scale magnetic fields from inflation in teleparallelism, in which the gravitational theory is described by the torsion scalar instead of the scalar curvature in general relativity. In particular, we examine the case that the conformal invariance of the electromagnetic field during inflation is broken by a non-minimal gravitational coupling between the torsion scalar and the electromagnetic field. It is shown that for a power-law type coupling, the magnetic field on 1 Mpc scale with its strength of \(\sim 10^{-9}\) G at the present time can be generated.
ISSN:2331-8422
DOI:10.48550/arxiv.1208.0665