Publication details

Homogeneous Einstein metrics on generalized flag manifolds with five isotropy summands

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Year of publication 2013
Type Article in Periodical
Magazine / Source International Journal of Mathematics
MU Faculty or unit

Faculty of Science

Field General mathematics
Keywords Homogeneous space; Einstein metric; Riemannian submersion; generalized flag manifold; isotropy representation; Weyl group.
Description We construct the homogeneous Einstein equation for generalized flag manifolds G/K of a compact simple Lie group G whose isotropy representation decomposes into five inequivalent irreducible Ad(K)-submodules. To this end, we apply a new technique which is based on a fibration of a flag manifold over another such space and the theory of Riemannian submersions.We classify all generalized flag manifolds with five isotropy summands, and we use Grobner bases to study the corresponding polynomial systems for the Einstein equation. For the generalized flag manifolds E6 /(SU(4)xSU(2)xU(1) x U(1)) and E7 /(U(1)xU(6)) we find explicitly all invariant Einstein metrics up to isometry. For the generalized flag manifolds SO(2n +1)/(U(1) xU(p)xSO(2(n-p-1)+ 1)) and SO(2n)/(U(1)xU(p)xSO(2(n-p-1))) we prove existence of at least two non-Kahler Einstein metrics. For small values of n and p we give the precise number of invariant Einstein metrics.
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