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Symmetries and reversing symmetries of toral automorphisms

REVIEW ARTICLE

Michael Baake1,3 and John A G Roberts2,4

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REVIEW ARTICLE

Recommended by J P Keating

Toral automorphisms, represented by unimodular integer matrices, are investigated with respect to their symmetries and reversing symmetries. We characterize the symmetry groups of {GL}(n,Bbb Z) matrices with a simple spectrum through their connection with unit groups in orders of algebraic number fields. For the question of reversibility, we derive necessary conditions in terms of the characteristic polynomial and the polynomial invariants. We also briefly discuss extensions to (reversing) symmetries within affine transformations, to {PGL}(n,Bbb Z) matrices, and to the more general setting of integer matrices beyond the unimodular ones.


PACS

02.10.-v Logic, set theory, and algebra

02.20.-a Group theory

MSC

15A36 Matrices of integers (See also 11C20)

20D45 Automorphisms

12D05 Polynomials: factorization

20G25 Linear algebraic groups over local fields and their integers

Subjects

Mathematical physics

Dates

Issue 4 (July 2001)

Received 13 June 2000, in final form 23 February 2001



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