Borel-Weil Theory for Root Graded Banach-Lie groups

Details Borel-Weil Theory for Root Graded Banach-Lie groups Borel-Weil Theory for Root Graded Banach-Lie groups

2009-03-06

arxiv.org/abs/0903.1188v1

Mathematics

Representation Theory

Scientific paper

In this paper we introduce (weakly) root graded Banach--Lie algebras and corresponding Lie groups as natural generalizations of group like $\GL_n(A)$ for a Banach algebra $A$ or groups like $C(X,K)$ of continuous maps of a compact space $X$ into a complex semisimple Lie group $K$. We study holomorphic induction from holomorphic Banach representations of so-called parabolic subgroups $P$ to representations of $G$ on holomorphic sections of homogeneous vector bundles over $G/P$. One of our main results is an algebraic characterization of the space of sections which is used to show that this space actually carries a natural Banach structure, a result generalizing the finite dimensionality of spaces of sections of holomorphic bundles over compact complex manifolds. We also give a geometric realization of any irreducible holomorphic representation of a (weakly) root graded Banach--Lie group $G$ and show that all holomorphic functions on the spaces $G/P$ are constant.

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