NJL BREAKING OF SUPERSYMMETRIC GUTS

We analyze the breakdown of SUSY GUTs driven by Nambu-Jona-Lasinio con densates. Starting with the most general gauge invariant and pure kahl erian lagrangian up to quartic order we solve the one-loop gap equatio n and determine the breaking direction. This is done for various class es of groups and spectra of fundamental particles which especially cov er the most promising unifying groups SU(5), SO(10) and E6. Heavy mass es for the fundamental as well as for the composite particles are calc ulated. The results are used to single out candidates which may lead t o an acceptable low energy theory. In these models we discuss some phe nomenological aspects and point out the difficulties in constructing p henomenological viable theories in our scenario.