Complete Bundle Moduli Reduction in Heterotic String Compactifications
arXiv:1203.4961 · doi:10.1007/JHEP05(2012)075
Abstract
A major problem in discussing heterotic string models is the stabilisation of the many vector bundle moduli via the superpotential generated by world-sheet instantons. In arXiv:1110.6315 we have discussed the method to make a discrete twist in a large and much discussed class of vector bundles such that the generation number gets new contributions (which can be tuned suitably) and at the same time the space of bundle moduli of the new, twisted bundle is a proper subspace (where the 'new', non-generic twist class exists) of the original bundle moduli space; one thus gets a model, closely related to the original model one started with, but with enhanced flexibility in the generation number and where on the other hand the number of bundle moduli is {\em somewhat} reduced. Whereas in the previous paper the emphasis was on examples for the new flexibility in the generation number we here classify and describe explicitly the twists and give the precise reduction formula (for the number of moduli) for SU(5) bundles leading to an SU(5) GUT group in four dimensions. Finally we give various examples where the bundle moduli space is reduced {\em completely}: the superpotential for such {\em rigid} bundles becomes a function of the complex structure moduli alone (besides the exponential Kahler moduli contribution).
20 pages
References in corpus (6)
- Stabilizing the Complex Structure in Heterotic Calabi-Yau Vacua
- The Atiyah Class and Complex Structure Stabilization in Heterotic Calabi-Yau Compactifications
- Perspectives on Pfaffians of Heterotic World-sheet Instantons
- World-sheet Instanton Superpotentials in Heterotic String theory and their Moduli Dependence
- On the Heterotic World-sheet Instanton Superpotential and its individual Contributions
- Moduli restriction and Chiral Matter in Heterotic String Compactifications