Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
1993-11-29
Commun.Anal.Geom. 2 (1994) 461-511
Physics
High Energy Physics
High Energy Physics - Theory
41 pages, AMSLaTeX file
Scientific paper
In the present paper we give a differential geometry formulation of the basic dynamical principle of the group--algebraic approach \cite{LeS92} --- the grading condition --- in terms of some holomorphic distributions on flag manifolds associated with the parabolic subgroups of a complex Lie group; and a derivation of the corresponding nonlinear integrable systems, and their general solutions. Moreover, the reality condition for these solutions is introduced. For the case of the simple Lie groups endowed with the canonical gradation, when the systems in question are reduced to the abelian Toda equations, we obtain the generalised Pl\"ucker representation for the pseudo--metrics specified by the K\"ahler metrics on the flag manifolds related to the maximal nonsemisimple parabolic subgroups; and the generalised infinitesimal Pl\"ucker formulas for the Ricci curvature tensors of these pseudo--metrics. In accordance with these formulas, the fundamental forms of the pseudo--metrics and the Ricci curvature tensors are expressed directly in terms of the abelian Toda fields, which have here the sense of K\"ahler potentials.
Razumov Alexander V.
Saveliev Mikhail V.
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