Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2006-10-13
Nucl.Phys.B772:1-24,2007
Physics
High Energy Physics
High Energy Physics - Theory
27 pages
Scientific paper
10.1016/j.nuclphysb.2007.02.030
We study the relationship between instanton counting in N=4 Yang-Mills theory on a generic four-dimensional toric orbifold and the semi-classical expansion of q-deformed Yang-Mills theory on the blowups of the minimal resolution of the orbifold singularity, with an eye to clarifying the recent proposal of using two-dimensional gauge theories to count microstates of black holes in four dimensions. We describe explicitly the instanton contributions to the counting of D-brane bound states which are captured by the two-dimensional gauge theory. We derive an intimate relationship between the two-dimensional Yang-Mills theory and Chern-Simons theory on generic Lens spaces, and use it to show that the correct instanton counting is only reproduced when the Chern-Simons contributions are treated as non-dynamical boundary conditions in the D4-brane gauge theory. We also use this correspondence to discuss the counting of instantons on higher genus ruled Riemann surfaces.
Griguolo Luca
Seminara Domenico
Szabo Richard J.
Tanzini Alessandro
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