Non-thermal phenomena in colliding galaxy clusters

M. Arnaud (CEA/DSM/IRFU/Service d’Astrophysique, Gif sur Yvette, France), M. Bruggen  (Jacobs University Bremen, Bremen, Germany), G. Brunetti  (Istituto di Radioastronomia, INAF, Bologna, Italy), J. O. Burns (CASA, University of Colorado, Boulder, USA), C. Ferrari (UNS, CNRS, OCA, Laboratoire Cassiopee, Nice, France), M. Markevitch (Harvard-Smithsonian Center for Astrophysics, NASA GSFC), H. J. A. Rottgering (Leiden Observatory, Leiden University, Leiden, The Netherlands), D. Ryu (Chungnam National University, Daejeon, Korea), C. L. Sarazin (University of Virginia, Charlottesville, VA, USA), T. Venturi (Istituto di Radioastronomia, INAF, Bologna, Italy)