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2009

Exophobic Quasi-Realistic Heterotic String Vacua

Assel, Benjamin, Christodoulides, Kyriakos, Faraggi, Alon E. et al.

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We demonstrate the existence of heterotic-string vacua that are free of massless exotic fields.

The need to break the non-Abelian GUT symmetries in k=1 heterotic-string models by Wilson lines, while preserving the GUT embedding of the weak-hypercharge and the GUT prediction sin^2\theta_w(M(GUT))=3/8, necessarily implies that the models contain states with fractional electric charge.
Such states are severely restricted by observations, and must be confined or sufficiently massive and diluted.
We construct the first quasi-realistic heterotic-string models in which the exotic states do not appear in the massless spectrum, and only exist, as they must, in the massive spectrum.

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