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A-GENERALIZATION-OF-VORONOI’S-REDUCTION-THEORY-AND-ITSAPPLICATION
A GENERALIZATION OF VORONOI’S REDUCTION THEORY AND ITS
APPLICATION
´ ¨
MATHIEU DUTOUR SIKIRIC, ACHILL SCHURMANN, AND FRANK VALLENTIN
ABSTRACT. We consider Voronoi’s reduction theory of positive definite quadratic
forms which is based on Delone subdivision. We extend it to forms and Delone
subdivisions having a prescribed symmetry group. Even more general, the theory is
developed for forms which are restricted to a linear subspace in the space of quadratic
forms. We apply the new theory to complete the classification of totally real thin
algebraic number fields which was recently initiated by Bayer-Fluckiger and Nebe.
Moreover, we apply it to construct new best known sphere coverings in dimensions
9, . . . , 15.
CONTENTS
1. Introduction 2
2. Background: Lattices, PQFs and Delone subdivisions 3
2.1. Lattices and PQFs 3
2.2. Delone polyhedra and Delone subdivisions 3
2.3. Voronoi’s reduction theory 5
3. Generalization of Voronoi’s reduction theory 6
3.1. Polyhedral description of secondary cones 6
3.2. Proof of the fundamental theorem 8
3.3. Flips and bistellar neighbors 11
4. Finiteness and equivariance
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