1992-1995 (CERN, Theoretical Physics Division); 
 1995-1996 (Madrid, Universidad Complutense);
 1997-1998 (Cambridge University, DAMTP); 
 1998-2000 (Boston, Tufts University);
 2000-2002 (University of Lausanne); 
 2002-2008 (CERN, Physics Department); 
 2013-2014 Full Professor in Theoretical Physics (National Competition);
 2013-2014 Full Professor in Astronomy and Astrophysics (National Competition).
 | 
           
               
                    
                    NEW
               
               
                    
               
               
                    Errata
                    
                    
            |