Localizing non-linear N=(2,2) sigma model on S2
Authors: Victor Alekseev, Guido Festuccia, Victor Mishnyakov, Nicolai Terziev and Maxim Zabzine
Preprint number: UUITP-09/22
We present a systematic study of N=(2,2) supersymmetric non-linear sigma models on S2 with the target being a Kähler manifold. We discuss their reformulation in terms of cohomological field theory. In the cohomological formulation we use a novel version of 2D self-duality which involves a U(1) action on S2. In addition to the generic model we discuss the theory with target space equivariance corresponding to a supersymmetric sigma model coupled to a non-dynamical supersymmetric background gauge multiplet. We discuss the localization locus and perform a one-loop calculation around the constant maps. We argue that the theory can be reduced to some exotic model over the moduli space of holomorphic disks.