Large scale correlations of quasar polarisation vectors: Hints of   extreme scale structures?
  A survey measuring quasar polarization vectors has been started in two regions towards the North and South Galactic Poles. Here, We review the discovery of significant correlations of orientations of polarization vectors over huge angular distances. We report new results including a larger sample of the quasars confirming the existence of coherent orientations at redshifts z>1. 
Remi A. Cabanac (1), Damien Hutsemekers (2), Dominique Sluse (2),   Herve Lamy (3) ((1) Canada-France-Hawaii Telescope, USA,...