Highly Influenced

# The Refined Topological Vertex

@inproceedings{Iqbal2007TheRT, title={The Refined Topological Vertex}, author={Amer Iqbal and Can Kozçaz and Cumrun Vafa}, year={2007} }

- Published 2007

We define a refined topological vertex which depends in addition on a parameter, which physically corresponds to extending the self-dual graviphoton field strength to a more general configuration. Using this refined topological vertex we compute, using geometric engineering, a two-parameter (equivariant) instanton expansion of gauge theories which reproduce the results of Nekrasov. The refined vertex is also expected to be related to Khovanov knot invariants.