Weighted lattice point enumeration in lecture hall order polytopes

Abstract

We consider weighted lattice point enumeration in lecture hall order polytopes. We observe that these half-open polytopes are closed under weight-lifting for a large class of polynomial weights, including monomials and weights given by binomial coefficients. For rooted trees, we prove that the corresponding (weighted) $h^{\ast }$-polynomial is real-rooted thereby complementing previous results of Savage-Visontai and Brändén-Leander.

9 pages, 2 figures