Dynamical determination of the fundamental couplings in supergravity models

We demonstrate that supergravity models containing the standard model, dilaton, and modulus naturally lead to dynamical symmetry breaking with good phenomenology. We assume primordial supersymmetry breaking in the form of a constant contribution to the superpotential. String inspired relations link fundamental couplings to the dilaton vacuum expectation value. We specialize to a class of models inspired by the 4D fermionic string. Nonrenormalizable terms in the superpotential naturally produce the Higgs mixing parameter μ suitable for our mechanism. We discuss extensions and limitations of our approach. copyright 1996 The American Physical Society