Enumeration of $\C{H}$-strata in quantum matrices with respect to dimension

Details Enumeration of $\C{H}$-strata in quantum matrices with respect to dimension Enumeration of $\C{H}$-strata in quantum matrices with respect to dimension

2010-09-13

arxiv.org/abs/1009.2474v2

Mathematics

Quantum Algebra

20 pages, 9 figures

Scientific paper

We present a combinatorial method to determine the dimension of $\C{H}$-strata in the algebra of $m\times n$ quantum matrices $\Oq$ as follows. To a given $\C{H}$-stratum we associate a certain permutation via the notion of pipe-dreams. We show that the dimension of the $\C{H}$-stratum is precisely the number of odd cycles in this permutation. Using this result, we are able to give closed formulas for the trivariate generating function that counts the $d$-dimensional $\C{H}$-strata in $\Oq$. Finally, we extract the coefficients of this generating function in order to settle conjectures proposed by the first and third named authors \cite{bldim,bll} regarding the asymptotic proportion of $d$-dimensional $\C{H}$-strata in $\Oq$.

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