Abstract
We prove that the K-theoretic Nekrasov instanton partition functions have a positive radius of convergence in the instanton counting parameter and are holomorphic functions of the Coulomb parameters in a suitable domain. We discuss the implications for the AGT correspondence and the analyticity of the norm of Gaiotto states for the deformed Virasoro algebra. The proof is based on random matrix techniques and relies on an integral representation of the partition function, due to Moore, Nekrasov, and Shatashvili, which we also prove.
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Acknowledgements
We thank Mikhail Bershtein, Christoph Keller, Sara Pasquetti, and Jörg Teschner for useful comments and explanations. The authors were partially supported by the National Centre of Competence in Research “SwissMAP – The Mathematics of Physics” of the Swiss National Science Foundation.
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Felder, G., Müller-Lennert, M. Analyticity of Nekrasov Partition Functions. Commun. Math. Phys. 364, 683–718 (2018). https://doi.org/10.1007/s00220-018-3270-1
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DOI: https://doi.org/10.1007/s00220-018-3270-1