Abstract
The Spherical Hecke central (SHc) algebra has been shown to act on the Nekrasov instanton partition functions of \( \mathcal{N}=2 \) gauge theories. Its presence accounts for both integrability and AGT correspondence. On the other hand, a specific limit of the Omega background, introduced by Nekrasov and Shatashvili (NS), leads to the appearance of TBA and Bethe like equations. To unify these two points of view, we study the NS limit of the SHc algebra. We provide an expression of the instanton partition function in terms of Bethe roots, and define a set of operators that generates infinitesimal variations of the roots. These operators obey the commutation relations defining the SHc algebra at first order in the equivariant parameter ϵ 2. Furthermore, their action on the bifundamental contributions reproduces the Kanno-Matsuo-Zhang transformation. We also discuss the connections with the Mayer cluster expansion approach that leads to TBA-like equations.
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Bourgine, JE. Spherical Hecke algebra in the Nekrasov-Shatashvili limit. J. High Energ. Phys. 2015, 114 (2015). https://doi.org/10.1007/JHEP01(2015)114
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DOI: https://doi.org/10.1007/JHEP01(2015)114