Geodesic
Cluster Toda chains and Nekrasov functions
Teoretičeskaâ i matematičeskaâ fizika, Tome 198 (2019) no. 2, pp. 179-214

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We extend the relation between cluster integrable systems and $q$-difference equations beyond the Painlevé case. We consider the class of hyperelliptic curves where the Newton polygons contain only four boundary points. We present the corresponding cluster integrable Toda systems and identify their discrete automorphisms with certain reductions of the Hirota difference equation. We also construct nonautonomous versions of these equations and find that their solutions are expressed in terms of five-dimensional Nekrasov functions with Chern–Simons contributions, while these equations in the autonomous case are solved in terms of Riemann theta functions.
Keywords: Supersymmetric gauge theories, cluster integrable systems, q-difference Painleve equation. 
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     author = {M. A. Bershtein and P. G. Gavrilenko and A. V. Marshakov},
     title = {Cluster {Toda} chains and {Nekrasov} functions},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
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     publisher = {mathdoc},
     volume = {198},
     number = {2},
     year = {2019},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_2019_198_2_a0/}
}
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M. A. Bershtein; P. G. Gavrilenko; A. V. Marshakov. Cluster Toda chains and Nekrasov functions. Teoretičeskaâ i matematičeskaâ fizika, Tome 198 (2019) no. 2, pp. 179-214. http://geodesic.mathdoc.fr/item/TMF_2019_198_2_a0/