Journal of Lie Theory 25 (2015), No. 2, 459--476
Copyright Heldermann Verlag 2015
The Splitting Problem for Complex Homogeneous Supermanifolds
Université du Luxembourg, 6 rue Richard Coudenhove-Kalergi, 1359 Luxembourg
It is a classical result that any complex analytic Lie supergroup G is split (see J.-L. Koszul, Graded manifolds and graded Lie algebras, Proceeding of the International Meeting on Geometry and Physics (Bologna), Pitagora, 71--84 (1982)), that is, its structure sheaf is isomorphic to the structure sheaf of a certain vector bundle. However, there do exist non-split complex analytic homogeneous supermanifolds.
We study the question how to find out whether a complex analytic homogeneous supermanifold is split or non-split. Our main result is a description of left invariant gradings on a complex analytic homogeneous supermanifold G/H in the terms of H-invariants. As a corollary to our investigations we get some simple sufficient conditions for a complex analytic homogeneous supermanifold to be split in terms of Lie algebras.
Keywords: Lie supergroup, complex homogeneous supermanifold.
MSC: 51P05, 53Z05, 32M10
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