Nested Hilbert schemes and the nested q,t-Catalan series

Details Nested Hilbert schemes and the nested q,t-Catalan series Nested Hilbert schemes and the nested q,t-Catalan series

2007-11-05

arxiv.org/abs/0711.0763v1

Mathematics

Algebraic Geometry

28 pages, 8 figures

Scientific paper

In this paper we study the tangent spaces of the smooth nested Hilbert scheme $ Hil{n,n-1}$ of points in the plane, and give a general formula for computing the Euler characteristic of a $\TT^2$-equivariant locally free sheaf on $\Hil{n,n-1}$. Applying our result to a particular sheaf, we conjecture that the result is a polynomial in the variables $q$ and $t$ with non-negative integer coefficients . We call this conjecturally positive polynomial as \textsl{the nested $q,t$-Cat alan series}, for it has many conjectural properties similar to that of the $q,t $-Catalan series.

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