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Picard-Fuchs ordinary differential systems in \(N=2\) supersymmetric Yang-Mills theories. (English) Zbl 0986.81101

Summary: In general, Picard-Fuchs systems in \(N=2\) supersymmetric Yang-Mills theories are realized as a set of simultaneous partial differential equations. However, if the quantum chromodynamics (QCD) scale parameter is used as a unique independent variable instead of moduli, the resulting Picard-Fuchs systems are represented by a single ordinary differential equation (ODE) whose order coincides with the total number of independent periods.
This paper discusses some properties of these Picard-Fuchs ODEs. In contrast with the usual Picard-Fuchs systems written in terms of moduli derivatives, there exists a Wronskian for this ordinary differential system and this Wronskian produces a new relation among periods, moduli, and QCD scale parameter, which in the case of SU(2) is reminiscent of the scaling relation of the prepotential.
On the other hand, in the case of the SU(3) theory, there are two kinds of ordinary differential equations, one of which is the equation directly constructed from periods and the other is derived from the SU(3) Picard-Fuchs equations in moduli derivatives identified with Appell’s \(F_4\) hypergeometric system, i.e., Burchnall’s fifth-order ordinary differential equation published in 1942. It is shown that four of the five independent solutions to the latter equation actually correspond to the four periods in the SU(3) gauge theory and the closed form of the remaining one is established by the SU(3) Picard-Fuchs ODE. The formula for this fifth solution is a new one.

MSC:

81T60 Supersymmetric field theories in quantum mechanics
34C60 Qualitative investigation and simulation of ordinary differential equation models
81V05 Strong interaction, including quantum chromodynamics
81T13 Yang-Mills and other gauge theories in quantum field theory
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