We study the non-linear sigma model realization of a heterotic vacuum with N=2 space-time supersymmetry. We examine the requirements of (0,2) + (0,4) worldsheet supersymmetry and show that a geometric vacuum must be described by a principal two-torus bundle over a K3 manifold. © SISSA 2011.
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Melnikov, I. V., & Minasian, R. (2011). Heterotic sigma models with N = 2 space-time supersymmetry. Journal of High Energy Physics, 2011(9). https://doi.org/10.1007/JHEP09(2011)065