A convexity theorem for the real part of a Borel invariant subvariety

Details A convexity theorem for the real part of a Borel invariant subvariety A convexity theorem for the real part of a Borel invariant subvariety

2007-09-20

arxiv.org/abs/0709.3287v3

Mathematics

Symplectic Geometry

17 pages, (restructured the document a bit) to appear in Proc. Amer. Math. Soc

Scientific paper

M. Brion proved a convexity result for the moment map image of an irreducible subvariety of a compact integral Kaehler manifold preserved by the complexification of the Hamiltonian group action. V. Guillemin and R. Sjamaar generalized this result to irreducible subvarieties preserved only by a Borel subgroup. In another direction, L. O'Shea and R. Sjamaar proved a convexity result for the moment map image of the submanifold fixed by an antisymplectic involution. Analogous to Guillemin and Sjamaar's generalization of Brion's theorem, in this paper we generalize O'Shea and Sjamaar's result, proving a convexity theorem for the moment map image of the involution fixed set of an irreducible subvariety preserved by a Borel subgroup.

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