On combinatorics of Voronoi polytopes for perturbations of the dual root lattices

TL;DR

This paper proves that certain Voronoi polytopes related to dual root lattices and their small perturbations satisfy the Voronoi conjecture, confirming the conjecture for a broad class of parallelohedra with specific combinatorial structures.

Contribution

It establishes the Voronoi conjecture for parallelohedra combinatorially equivalent to dual root lattice Voronoi polytopes under small perturbations.

Findings

Voronoi conjecture holds for dual root lattice Voronoi polytopes.

Perturbations of these polytopes also satisfy the conjecture.

Specific combinatorial restrictions ensure the conjecture's validity.

Abstract

The Voronoi conjecture on parallelohedra claims that for every convex polytope $P$ that tiles Euclidean $d$-dimensional space with translations there exists a $d$-dimensional lattice such that $P$ and the Voronoi polytope of this lattice are affinely equivalent. The Voronoi conjecture is still open for the general case but it is known that some combinatorial restriction for the face structure of $P$ ensure that the Voronoi conjecture holds for $P$. In this paper we prove that if $P$ is the Voronoi polytope of one of the dual root lattices $\mathsf{D}_d^*$, $\mathsf{E}_6^*$, $\mathsf{E}_7^*$ or $\mathsf{E}_8^*=\mathsf{E}_8$ or their small perturbations, then every parallelohedron combinatorially equivalent to $P$ in strong sense satisfies the Voronoi conjecture.