Abstract
In heterotic string theories consistency requires the introduction of a non-trivial vector bundle. This bundle breaks the original ten-dimensional gauge groups E8 × E8 or SO(32) for the supersymmetric heterotic string theories and SO(16) × SO(16) for the non-supersymmetric tachyon-free theory to smaller subgroups. A vast number of MSSM-like models have been constructed up to now, most of which describe the vector bundle as a sum of line bundles. However, there are several different ways of describing these line bundles and their embedding in the ten-dimensional gauge group. We recall and extend these different descriptions and explain how they can be translated into each other.
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Nibbelin, S.G., Ruehle, F. Line bundle embeddings for heterotic theories. J. High Energ. Phys. 2016, 186 (2016). https://doi.org/10.1007/JHEP04(2016)186
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DOI: https://doi.org/10.1007/JHEP04(2016)186