A bstract We apply localization techniques to A -twisted N N = (2) theories of vector multiplets on S 2 . We derive formulae for A -model partition functions and correlators as integrals along a real contour, as opposed to a complex one. Using the correlator formula, we successfully recover the unstable instanton partition function of pure two-dimensional Yang-Mills theory from the vacuum expectation value of an A -model operator.
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Emil Hakan Leeb-lundberg (2024) studied this question.
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