Instanton counting, Macdonald function and the moduli space of D-branes

Abstract

We argue the connection of Nekrasov's partition function in the Ωbackground and the moduli space of D-branes, suggested by the idea of geometric engineering and Gopakumar-Vafa invariants. In the instanton expansion of N=2 SU(2) Yang-Mills theory the Nakrasov's partition function with equivariant parameters ε_1, ε_2 of toric action on C^2 factorizes correctly as the character of SU(2)_L \times SU(2)_R spin representation. We show that up to two instantons the spin contents are consistent with the Lefschetz action on the moduli space of D2-branes on (local) F_0. We also present an attempt at constructing a refined topological vertex in terms of the Macdonald function. The refined topological vertex with two parameters of T^2 action allows us to obtain the generating functions of equivariant χ_y and elliptic genera of the Hilbert scheme of n points on C^2 by the method of topological vertex.

arXiv comment33 pages, 2 figures, (v2) minor changes, references added, (v3) Comments and more references added

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• A slow review of the AGT correspondence
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• q-deformations of two-dimensional Yang-Mills theory: Classification, categorification and refinement
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• Comment on integrability in Dijkgraaf-Vafa beta-ensembles
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