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.

• Received 24 October 1995

DOI:https://doi.org/10.1103/PhysRevLett.76.1998