MAGNETIC CONDENSATION, NON TRIVIAL GAUGE DYNAMICS AND CONFINEMENT IN A 6-D MODEL

A six dimensional model describing the interaction of gravity with gau ge fields whose dynamics is consistent with redefinitions of the measu re of integration in the action is defined. This is achieved for the c hoice root\FABFAB\ for the lagrangian density of gauge fields. In the absence of gauge field condensates, a confinement phase exists. In con trast, a magnetic condensation can be responsible for both the compact ification of two dimensions into a sphere and for generating normal pr opagating gauge excitations and therefore the elimination of confineme nt. The matching of the confined and deconfined phases and the formati on of ''bags'' in this model is discussed. In contrast with the Coulom b solution of ordinary electromagnetism we expect here the field of el ementary charges to be non singular. If the gauge field is a composite of two primitive scalars, the model has a remarkable geometrical inte rpretation. (C) 1997 Elsevier Science B.V.