Abstract
One of the most important issues in string theory is to understand the structure of group and the pattern of symmetry breaking. In this chapter, we discuss how the orbifolding of the heterotic string renders a low energy group. In fact, we can see the underlying symmetries of the spectrum just from the theory of Lie algebra and its generalization called the affne Lie algebra.
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Choi, KS., Kim, J.E. (2006). String Orbifold Spectra. In: Quarks and Leptons From Orbifolded Superstring. Lecture Notes in Physics, vol 696. Springer, Berlin, Heidelberg . https://doi.org/10.1007/3-540-32764-9_9
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DOI: https://doi.org/10.1007/3-540-32764-9_9
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