ON AUTOMORPHISMS OF EXTREMAL EVEN UNIMODULAR LATTICES

Author:

NEBE GABRIELE1

Affiliation:

1. Lehrstuhl D für Mathematik, RWTH Aachen University, 52056 Aachen, Germany

Abstract

The automorphism groups of the three known extremal even unimodular lattices of dimension 48 and the one of dimension 72 are determined using the classification of finite simple groups. Restrictions on the possible automorphisms of 48-dimensional extremal lattices are obtained. We classify all extremal lattices of dimension 48 having an automorphism of order m with φ(m) > 24. In particular the lattice P48nis the unique extremal 48-dimensional lattice that arises as an ideal lattice over a cyclotomic number field.

Publisher

World Scientific Pub Co Pte Lt

Subject

Algebra and Number Theory

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