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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 sin²θ0.231 in conformal gauge theories with three chiral families.
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Paul H. Frampton (1999) studied this question.
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