The toroidal block and the genus expansion Article - Mars 2013

Amir-Kian Kashani-Poor, Jan Troost

Amir-Kian Kashani-Poor, Jan Troost, « The toroidal block and the genus expansion  », Journal of High Energy Physics, mars 2013. ISSN 1126-6708


We study the correspondence between four-dimensional supersymmetric gauge theories and two-dimensional conformal field theories in the case of N=2* gauge theory. We emphasize the genus expansion on the gauge theory side, as obtained via geometric engineering from the topological string. This point of view uncovers modular properties of the one-point conformal block on a torus with complexified intermediate momenta : in the large intermediate weight limit, it is a power series whose coefficients are quasi-modular forms. The all-genus viewpoint that the conformal field theory approach lends to the topological string yields insight into the analytic structure of the topological string partition function in the field theory limit.

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