Maxwell-Kostelecký Electromagnetism and Cosmic Magnetization
arXiv:0812.3745 · doi:10.1016/j.physletb.2009.04.011
Abstract
The Lorentz violating term in the photon sector of Standard Model Extension, $\mathcal{L}_K = -{$\frac14$} (k_F)_{αβμν} F^{αβ} F^{μν}$ (here referred to as the Kostelecký term), breaks conformal invariance of electromagnetism and enables a superadiabatic amplification of magnetic vacuum fluctuations during inflation. For a wide range of values of parameters defining Lorentz symmetry violation and inflation, the present-day magnetic field can have an intensity of order of nanogauss on megaparsec scales and then could explain the large-scale magnetization of the universe.
10 pages, 1 figure, minor revisions; accepted for publication in Physics Letters B