ORBIFOLDS WITH DISCRETE TORSION AND MIRROR SYMMETRY

Abstract

For a large class of $N=2$ SCFTs, which includes minimal models and many $\s$ models on Calabi-Yau manifolds, the mirror theory can be obtained as an orbifold. We show that in such a situation the construction of the mirror can be extended to the presence of discrete torsions. In the case of the $\ZZ_2\ex\ZZ_2$ torus orbifold, discrete torsion between the two generators directly provides the mirror model. Working at the Gepner point it is, however, possible to understand this mirror pair as a special case of the Berglund--H"ubsch construction. This seems to indicate that the $\ZZ_2\ex\ZZ_2$ example is a mere coincidence, due to special properties of $\ZZ_2$ twists, rather than a hint at a new mechanism for mirror symmetry.

11 pages, LaTeX

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• Heterotic (0,2) Gepner Models and Related Geometries
• Counting charged massless states in the (0,2) heterotic CFT/geometry connection
• Reflexive polyhedra, weights and toric Calabi-Yau fibrations