http://www.physorg.com/news3306.html
this study of mackay is very interesting.the beam light suffer differents refraction,until negative index refraction-bending the light through of massive rotating massive black hole-that can altere the ways for light rays,it is modifing the light speed,and therefore in regions next big -bang alterations strange must have occured to beam of light,including ways backward in space-time trough of non-comutative systems with comutative imaginary opperators in universe of 16-dimension.to a 4th world the coordinates of space-time are
non-comutative-violate causality or permit the preferential reference systems,that create a new physics-then there is violation of opperator pt,and some antiparticles do not existe in our space-time referential.
a.pocobi