Abstract
We describe a new class of instanton effects in string compactifications that preserve only N ≤ 1 supersymmetry in four dimensions. As is well-known, worldsheet or brane instantons in such a background can sometimes contribute to an effective superpotential for the moduli of the compactification. We generalize this phenomenon by showing that such instantons can also contribute to new multi-fermion and higher-derivative F-terms in the low-energy effective action. We consider in most detail the example of heterotic compactification on a Calabi-Yau threefold X with gauge bundle V, in which case we study worldsheet instanton effects that deform the complex structure of the moduli space associated to X and V. We also give new, slightly more economical derivations of some previous results about worldsheet instantons in Type IIA Calabi-Yau compactifications.
Original language | English (US) |
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Pages (from-to) | 60 |
Number of pages | 1 |
Journal | Journal of High Energy Physics |
Issue number | 2 |
DOIs | |
State | Published - Feb 1 2006 |
Externally published | Yes |
All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics
Keywords
- Solitons Monopoles and Instantons
- Superstrings and Heterotic Strings
- Topological Strings