Solving Gauss' Laws and Searching Dirac Observables for the Four Interactions

Abstract

A review is given of the status of the program of classical reduction to Dirac's observables of the four interactions (standard SU(3)xSU(2)xU(1) particle model and tetrad gravity) with the matter described either by Grassmann-valued fermion fields or by particles with Grassmann charges.Comment: 9 pages, LaTeX (using espcrc2.sty). Talk given at the Second Conf. on Constrained Dynamics and Quantum Gravity, S.Margherita Ligure, 17-21 September 199