# Spontaneous breaking of Lorentz invariance in gauge theories

I was browsing through the hep-th arXiv and came across this article:

Spontaneous Lorentz Violation in Gauge Theories. A. P. Balachandran, S. Vaidya. arXiv:1302.3406 [hep-th]. (Submitted on 14 Feb 2013)

The authors say that Lorentz symmetry is spontaneously broken in QED and also in non-abelian gauge theories by infrared effects. However as far as I know the observed world is Lorentz invariant. Can someone kindly explain to me what is going on? Thanks for any help!

-
Huh interesting, +1. I hope somebody will give an answer here ... –  Dilaton Feb 18 '13 at 11:18
They enlarge the gauge group to a "Sky" group that doesn't commute with Lorentz transformations and then superselect based on the new group. So of course they break Lorentz invariance. My problem is motivation. Why do they think what they are doing is physical? I really don't understand... –  Michael Brown Feb 18 '13 at 14:19