String Theory Seminar
Thursday, January 24, 2002
Katrin Wendland (UNC at Chapel Hill),
Aspects of Mirror Symmetry for Orbifold CFTs on K3
We investigate a specific version of mirror symmetry for ZM
orbifold conformal field theories on K3.
Our starting point is a description of mirror symmetry for toroidal models
which is a simple precursor of the Strominger/Yau/Zaslow approach
and which allows for an explicit formulation both in geometric and
conformal field theoretic terms. Moreover, the ZM
orbifold construction can be carried out independently in both pictures and
allows for a continuation of the mirror map to orbifold limits of K3 on
the one hand and orbifold conformal field theories on the other. We determine
explicit formulas for this mirror map as an element of the modular group
of the moduli space of N=(4,4) superconformal field theories on K3
found by Aspinwall and Morrison. By comparing the geometric results
to the conformal field theoretic ones we are able to determine the geometric
counter parts of the twist fields in our orbifold conformal field theories.
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