1996
DOI: 10.1016/0550-3213(96)00142-3
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Three generations in the fermionic construction

Abstract: We obtain three generation SU (3) c ×SU (2) L ×U (1) Y string models in all of the exactly solvable (0, 2) constructions sampled by fermionization. None of these examples, including those that are symmetric abelian orbifolds, rely on the Z 2 ×Z 2 orbifold underlying the NAHE basis. We present the first known three generation models for which the hypercharge normalization, k 1 , takes values smaller than that obtained from an SU (5) embedding, thus lowering the effective gauge coupling unification scale. All of… Show more

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Cited by 92 publications
(159 citation statements)
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“…In Figure II we show our results for values of Λ 3 which step by a factor of four; we assume Λ SUSY = 1 TeV for these (solid) curves. For comparison we also show the MSSM unification predictions (dashed) with Λ SUSY stepping by factors of four; in the MSSM case we take k Y = 5/3 and assume threshold corrections 64) where each of the quantities on the right-hand side are assumed as above. We also show with error bars the experimental values (5.25).…”
Section: Gauge Coupling Unificationmentioning
confidence: 99%
“…In Figure II we show our results for values of Λ 3 which step by a factor of four; we assume Λ SUSY = 1 TeV for these (solid) curves. For comparison we also show the MSSM unification predictions (dashed) with Λ SUSY stepping by factors of four; in the MSSM case we take k Y = 5/3 and assume threshold corrections 64) where each of the quantities on the right-hand side are assumed as above. We also show with error bars the experimental values (5.25).…”
Section: Gauge Coupling Unificationmentioning
confidence: 99%
“…reproduce the massless root vectors in the lattice of SO (12). Here e i = {e I i } are six linearly-independent vielbeins normalized so that (e i ) 2 = 2.…”
Section: General Structure Of Free Fermionic Modelsmentioning
confidence: 99%
“…The same model is obtained in the geometric (bosonic) language by tuning the background fields to the values corresponding to the SO(12) lattice. The metric of the six-dimensional compactified manifold is then the Cartan matrix of SO (12), while the antisymmetric tensor is given by…”
Section: General Structure Of Free Fermionic Modelsmentioning
confidence: 99%
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“…Thus, R-parity violation is allowed while proton decay is forbidden. It will be of further interest to examine whether similar mechanism can operate in other string models [20,21]. For example, the SO(6) × SO(4) type models are of particular interest as they also can in principle differentiate between the lepton-number and baryon-number violating operators.…”
Section: Qldnmentioning
confidence: 99%