Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
1992-04-30
Nucl.Phys.B386:405-452,1992
Physics
High Energy Physics
High Energy Physics - Theory
60 pages
Scientific paper
10.1016/0550-3213(92)90572-S
We show that ${\rm Tr}(-1)^F F e^{-\beta H}$ is an index for $N$=2 supersymmetric theories in two dimensions, in the sense that it is independent of almost all deformations of the theory. This index is related to the geometry of the vacua (Berry's curvature) and satisfies an exact differential equation as a function of $\beta$. For integrable theories we can also compute the index thermodynamically, using the exact $S$-matrix. The equivalence of these two results implies a highly non-trivial equivalence of a set of coupled integral equations with these differential equations, among them Painleve III and the affine Toda equations.
Cecotti Sergio
Fendley Paul
Intriligator Ken
Vafa Cumrun
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