Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
1998-10-22
Nucl.Phys. B546 (1999) 135-154
Physics
High Energy Physics
High Energy Physics - Theory
17 pages LateX 2E, 2 figures (eps)
Scientific paper
10.1016/S0550-3213(99)00011-5
Characters of $E_8\otimes E_8$ and SO(32) heterotic strings involving the full internal symmetry Cartan subalgebra generators are defined after circle compactification so that they are T dual. The novel point, as compared with an earlier study of the type II case (hep-th/9707107), is the appearence of Wilson lines. Using SO(17,1) transformations between the weight lattices reveals the existence of an intermediate theory where T duality transformations are disentangled from the internal symmetry. This intermediate theory corresponds to a sort of twisted compactification of a novel type. Its modular invariance follows from an interesting interplay between three representations of the modular group.
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