Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2008-01-31
Lett.Math.Phys.84:257-273,2008
Physics
High Energy Physics
High Energy Physics - Theory
38 pages. Minor changes to Section 2.3 and corrections to Section 4.2. Final results unchanged. Typos corrected
Scientific paper
10.1007/s11005-008-0249-4
We explore the nonperturbative aspects of the chiral algebras of N = (0,2) sigma models, which perturbatively are intimately related to the theory of chiral differential operators (CDOs). The grading by charge and scaling dimension is anomalous if the first Chern class of the target space is nonzero. This has some nontrivial consequences for the chiral algebra. As an example, we study the case where the target space is CP^1, and show that worldsheet instantons trivialize the chiral algebra entirely. Consequently, supersymmetry is spontaneously broken in this model. We then turn to a closer look at the supersymmetry breaking from the viewpoint of Morse theory on loop space. We find that instantons interpolate between pairs of perturbative supersymmetric states with different fermionic numbers, hence lifting them out of the supersymmetric spectrum. Our results reveal that a "quantum" deformation of the geometry of the target space leads to a trivialization of the kernels of certain twisted Dirac operators on CP^1.
Tan Meng-Chwan
Yagi Junya
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