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hep-th2019★ 26 cited
Conformal Perturbation Theory for Twisted Fields
Christoph A. Keller, Ida G. Zadeh
We investigate second order conformal perturbation theory for orbifolds of conformal field theories in two dimensions. To evaluate the necessary twisted sector corre…
hep-th2019★ 21 cited
Lifting 1/4-BPS States on K3 and Mathieu Moonshine
Christoph A. Keller, Ida G. Zadeh
The elliptic genus of K3 is an index for the 1/4-BPS states of its sigma model. At the torus orbifold point there is an accidental degeneracy of such states. We blow up the orbifol…