2007/01/31 by Amer Iqbal, Can Kozcaz, Cumrun Vafa · 1 citation
Physics and Astronomy · #hep-th
paper · pdf · doi:10.1088/1126-6708/2009/10/069
published as JHEP 0910:069,2009 · 70 Pages, 23 Figures
arxiv created 2009/03/12 · arxiv updated 2009/12/01
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.