Normalizers of ad-nilpotent ideals

Details Normalizers of ad-nilpotent ideals Normalizers of ad-nilpotent ideals

2004-02-09

arxiv.org/abs/math/0402140v3

Mathematics

Representation Theory

26 pages; New section 4 is added; References added

Scientific paper

Let $\be$ be a Borel subalgebra of a complex simple Lie algebra $\g$. An ideal of $\be$ is called ad-nilpotent, if it is contained in $[\be,\be]$. We give several descriptions of the normalizer of an ad-nilpotent ideal: using the weight of an ideal, or the affine Weyl group, or a relationship with dominant regions of the Shi arrangement. We also give a description of those ideals whose normalizer is equal to $\be$. For sl(n) and sp(2n), explicit enumerative results are obtained, which demonstrate a connection with some famous integer sequences.

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