Toda lattice and toric varieties for real split semisimple Lie algebras

The paper concerns the topology of an isospectral real smooth manifold for certain Jacobi element associated with real split semisimple Lie algebra. The manifold is identified as a compact, connected completion of the disconnected Cartan subgroup of the corresponding Lie group G ̃ which is a disjoint union of the split Cartan subgroups associated to semisimple portions of Levi factors of all standard parabolic subgroups of G̃. The manifold is also related to the compactified level sets of a generalized Toda lattice equation defined on the semisim-ple Lie algebra, which is diffeomorphic to a toric variety in the flag manifold G̃/B with Borel subgroup B of G̃. We then give a cellular decomposition and the associated chain complex of the manifold by introducing colored-signed Dynkin diagrams which parametrize the cells in the decomposition. 1. Introduction