Rootless pairs of $E{E}_8$-lattices

Abstract

We describe a classification of pairs $M,N$ of lattices isometric to $E{E}_8:=\sqrt{2}{E}_8$ such that the lattice $M+N$ is integral and rootless and such that the dihedral group associated to them has order at most 12. It turns out that most of these pairs may be embedded in the Leech lattice. Complete proofs will appear in another article. This theory of integral lattices has connections to vertex operator algebra theory and moonshine.

arXiv comment87 pages, many figures