Mirabolic Robinson-Shensted-Knuth correspondence

Details Mirabolic Robinson-Shensted-Knuth correspondence Mirabolic Robinson-Shensted-Knuth correspondence

2008-02-12

arxiv.org/abs/0802.1651v3

Selecta Math. (N.S.) 14 (2009), no. 3-4, 727-758

Mathematics

Algebraic Geometry

33 pages. References updated

Scientific paper

The set of orbits of $GL(V)$ in $Fl(V)\times Fl(V)\times V$ is finite, and is parametrized by the set of certain decorated permutations in a work of Solomon. We describe a Mirabolic RSK correspondence (bijective) between this set of decorated permutations and the set of triples: a pair of standard Young tableaux, and an extra partition. It gives rise to a partition of the set of orbits into combinatorial cells. We prove that the same partition is given by the type of a general conormal vector to an orbit. We conjecture that the same partition is given by the bimodule Kazhdan-Lusztig cells in the bimodule over the Iwahori-Hecke algebra of $GL(V)$ arising from $Fl(V)\times Fl(V)\times V$. We also give conjectural applications to the classification of unipotent mirabolic character sheaves on $GL(V)\times V$.

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