Singletons, physics in AdS universe and oscillations of composite neutrinos

The study starts with the kinematical aspects of singletons and massless pa rticles. It extends to the beginning of a field theory of composite element ary particles and its relations with conformal field theory, including very recent developments and speculations about a possible interpretation of ne utrino oscillations and CP violation in this context. This framework was de veloped during the past twenty years. Based on our deformation philosophy o f physical theories, it deals with elementary particles composed of singlet ons in anti-De Sitter spacetime.