Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2006-10-25
JHEP 0706:037,2007
Physics
High Energy Physics
High Energy Physics - Theory
29 pages, 15 figures, reference added, typos corrected, version published in JHEP
Scientific paper
10.1088/1126-6708/2007/06/037
The a-maximization technique proposed by Intriligator and Wecht allows us to determine the exact R-charges and scaling dimensions of the chiral operators of four-dimensional superconformal field theories. The problem of existence and uniqueness of the solution, however, has not been addressed in general setting. In this paper, it is shown that the a-function has always a unique critical point which is also a global maximum for a large class of quiver gauge theories specified by toric diagrams. Our proof is based on the observation that the a-function is given by the volume of a three dimensional polytope called "zonotope", and the uniqueness essentially follows from Brunn-Minkowski inequality for the volume of convex bodies. We also show a universal upper bound for the exact R-charges, and the monotonicity of a-function in the sense that a-function decreases whenever the toric diagram shrinks. The relationship between a-maximization and volume-minimization is also discussed.
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