Quasiperiodic packings of G-clusters and Baake-Moody sets

Details Quasiperiodic packings of G-clusters and Baake-Moody sets Quasiperiodic packings of G-clusters and Baake-Moody sets

2003-09-05

arxiv.org/abs/math-ph/0309017v1

Physics

Mathematical Physics

11 pages, LaTeX2e in IOPP style

Scientific paper

The diffraction pattern of a quasicrystal admits as symmetry group a finite group G, and there exists a G-cluster C (a union of orbits of G) such that the quasicrystal can be regarded as a quasiperiodic packing of copies of C, generally, partially occupied. On the other hand, by starting from the G-cluster C we can define in a canonical way a permutation representation of G in a higher dimensional space, decompose this space into the orthogonal sum of two G-invariant subspaces and use the strip projection method in order to define a pattern which can also be regarded as a quasiperiodic packing of copies of C, generally, partially occupied. This mathematical algorithm is useful in quasicrystal physics, but the dimension of the superspace we have to use in the case of a two or three-shell cluster is rather large. We show that the generalization concerning the strip projection method proposed by Baake and Moody [Proc. Int. Conf. Aperiodic' 97 (Alpe d'Huez, 27-31 August, 1997) ed M de Boissieu et al. (Singapore: World Scientific, 1999) pp 9-20] allows to reduce this dimension, and present some examples.

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