Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
1994-05-15
Int.J.Mod.Phys. A10 (1995) 895-922
Physics
High Energy Physics
High Energy Physics - Theory
27 pages, LaTex, Preprint ENSLAPP-L-467/94
Scientific paper
We define consistent finite-superfields reductions of the $N=1,2$ super-KP hierarchies via the coset approach we already developped for reducing the bosonic KP-hierarchy (generating e.g. the NLS hierarchy from the $sl(2)/U(1)-{\cal KM}$ coset). We work in a manifestly supersymmetric framework and illustrate our method by treating explicitly the $N=1,2$ super-NLS hierarchies. W.r.t. the bosonic case the ordinary covariant derivative is now replaced by a spinorial one containing a spin ${\textstyle {1\over 2}}$ superfield. Each coset reduction is associated to a rational super-$\cw$ algebra encoding a non-linear super-$\cw_\infty$ algebra structure. In the $N=2$ case two conjugate sets of superLax operators, equations of motion and infinite hamiltonians in involution are derived. Modified hierarchies are obtained from the original ones via free-fields mappings (just as a m-NLS equation arises by representing the $sl(2)-{\cal KM}$ algebra through the classical Wakimoto free-fields).
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