Stable Hilbert series of $\mathcal S(\mathfrak g)^K$ for classical groups

Details Stable Hilbert series of $\mathcal S(\mathfrak g)^K$ for classical groups Stable Hilbert series of $\mathcal S(\mathfrak g)^K$ for classical groups

2005-10-29

arxiv.org/abs/math/0510649v2

Mathematics

Representation Theory

24 pages

Scientific paper

Given a classical symmetric pair, $(G,K)$, with $\mathfrak g = Lie(G)$, we provide descriptions of the Hilbert series of the algebra of $K$-invariant vectors in the associated graded algebra of $\mathcal U(\mathfrak g)$ viewed as a $K$-representation under restriction of the adjoint representation. The description illuminates a certain stable behavior of the Hilbert series, which is investigated in a case-by-case basis. We note that the stable Hilbert series of one symmetric pair often coincides with others. Also, for the case of the real form $U(p,q)$ we derive a closed expression for the Hilbert series when $\min(p,q) \to \infty$.

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