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 ~10-9 G on 1 Mpc scale can be generated, if the backreaction effects and strong coupling problem are not taken into consideration.
- Publication:
-
JPS Conference Proceedings
- Pub Date:
- 2014
- DOI:
- 10.7566/JPSCP.1.013123
- arXiv:
- arXiv:1307.7448
- Bibcode:
- 2014JPSCP...1a3123B
- Keywords:
-
- Astrophysics - Cosmology and Nongalactic Astrophysics;
- General Relativity and Quantum Cosmology
- E-Print:
- 4 pages, no figure, to be published in the Proceedings of the "12th Asia Pacific Physics Conference."