Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2005-04-03
Nucl.Phys.B728:83-108,2005
Physics
High Energy Physics
High Energy Physics - Theory
31 pages. Standard LaTeX. Additional section on twisted moduli. typos corrected. Revised version to appear in NPB
Scientific paper
10.1016/j.nuclphysb.2005.08.028
I illustrate the existence of quasi-realistic heterotic-string models in which all the untwisted Kaehler and complex structure moduli, as well as all of the twisted sectors moduli, are projected out by the generalized GSO projections. I discuss the conditions and characteristics of the models that produce this result. The existence of such models offers a novel perspective on the realization of extra dimensions in string theory. In this view, while the geometrical picture provides a useful mean to classify string vacua, in the phenomenologically viable cases there is no physical realization of extra dimensions. The models under consideration correspond to Z2 X Z2 orbifolds of six dimensional tori, plus additional identifications by internal shifts and twists. The special property of the Z2 X Z2 orbifold is that it may act on the compactified dimensions as real, rather than complex, dimensions. This property enables an asymmetric projection on all six internal coordinates, which enables the projection of all the untwisted Kaehler and complex structure moduli.
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