Breakdown of Duality in (0,2) Superstring Models
نویسنده
چکیده
After pointing out the role of the compactification lattice for spectrum calculations in orbifold models, I discuss modular discrete symmetry groups for ZN orbifolds. I consider the Z7 orbifold as a nontrivial example of a (2,2) model and give the generators of the modular group for this case, which does not contain [SL(2,Z)]3 as had been speculated. I also discuss how to treat cases where quantized Wilson lines are present. I consider in detail an example, demonstrating that quantized Wilson lines affect the modular group in a nontrivial manner. In particular, I show that it is possible for a Wilson line to break SL(2,Z).
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