Conformality and gauge coupling unification

It has been recently proposed to embed the standard model in a conformal gauge theory to resolve the hierarchy problem, and to avoid assuming either grand unification or low-energy supersymmetry. By model building based on string-field duality, we show how to maintain the successful prediction of an electroweak mixing angle with sin{sup 2} {theta}{approx_equal}0.231 in conformal gauge theories with three chiral families. {copyright} {ital 1999} {ital The American Physical Society}