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Instanton counting on blowup. II. K-theoretic partition function
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Instanton counting on blowup. II. K-theoretic partition function
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We study Nekrasov's deformed partition function of 5-dimensional supersymmetric Yang-Mills theory compactified on a circle. Mathematically it is the generating function of the characters of the coordinate rings of the moduli spaces of instantons on $\mathbb R^4$. We show that it satisfies a system of functional equations, called blowup equations, whose solution is unique. As applications, we prove (a) logarithm of the partition function times $\epsilon_1\epsilon_2$ is regular at $\epsilon_1 = \epsilon_2 = 0$, (a part of Nekrasov's conjecture), and (b) the genus 1 parts, which are first several Taylor coefficients of the logarithm of the partition function, are written explicitly in terms of the Seiberg-Witten curves in rank 2 case.
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Generalised global symmetries in 5d $\mathcal{N}=1$ theories from the blow-up equations
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