A Basis for the Symplectic Group Branching Algebra

Details A Basis for the Symplectic Group Branching Algebra A Basis for the Symplectic Group Branching Algebra

2010-05-13

arxiv.org/abs/1005.2320v2

Mathematics

Representation Theory

20 pages, v2

Scientific paper

The symplectic group branching algebra, B, is a graded algebra whose components encode the multiplicities of irreducible representations of Sp(2n-2,C) in each irreducible representation of Sp(2n,C). By describing on B an ASL structure, we construct an explicit standard monomial basis of B consisting of Sp(2n-2,C) highest weight vectors. Moreover, B is known to carry a canonical action of the n-fold product SL(2) \times ... \times SL(2), and we show that the standard monomial basis is the unique (up to scalar) weight basis associated to this representation. Finally, using the theory of Hibi algebras we describe a deformation of Spec(B) into an explicit toric variety.

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