$N=4$ super KdV equation

Details $N=4$ super KdV equation $N=4$ super KdV equation

1993-01-08

arxiv.org/abs/hep-th/9301024v2

Phys.Lett. B309 (1993) 312-319

Physics

High Energy Physics

High Energy Physics - Theory

11 pages, preprint ENSLAPP-L-415-92

Scientific paper

10.1016/0370-2693(93)90939-F

We construct $N=4$ supersymmetric KdV equation as a hamiltonian flow on the $N=4\;SU(2)$ super Virasoro algebra. The $N=4$ KdV superfield, the hamiltonian and the related Poisson structure are concisely formulated in $1D \;N=4$ harmonic superspace. The most general hamiltonian is shown to necessarily involve $SU(2)$ breaking parameters which are combined in a traceless rank 2 $SU(2)$ tensor. First nontrivial conserved charges of $N=4$ super KdV (of dimensions 2 and 4) are found to exist if and only if the $SU(2)$ breaking tensor is a bilinear of some $SU(2)$ vector with a fixed length proportional to the inverse of the central charge of $N=4\;SU(2)$ algebra. After the reduction to $N=2$ this restricted version of $N=4$ super KdV goes over to the $a=4$ integrable case of $N=2$ super KdV and so is expected to be integrable. We show that it is bi-hamiltonian like its $N=2$ prototype.

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