2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/51167In a preceding report (hep-th/0112261), Pierre Ramond outlined a programme we have followed recently. An important ingredient in a future unique theory for basic physics must be a unique mathematical structure. It is then interesting to investigate the underlying mathematical structure of 11-dimensional space-time. A search for exceptional group structures specific to eleven dimensions leads us then to a study of the coset F_4/SO(9),which may provide a generalization of eleven-dimensional supergravity. This scheme is more general though and in this report we will show the corresponding structure related to the coset SU(3)/SU(2) x U(1), where we interpret the U(1) as the helicity group in four dimensions.23 pages, Latex. Contribution to Francqui Foundation Meeting in the honor of Marc Henneaux, October 2001, BrusselsHigh Energy Physics - Theorytext