Spectral representations of vertex transitive graphs, Archimedean solids and finite Coxeter groups

Details Spectral representations of vertex transitive graphs, Archimedean solids and finite Coxeter groups Spectral representations of vertex transitive graphs, Archimedean solids and finite Coxeter groups

2011-06-13

arxiv.org/abs/1106.2509v1

Mathematics

Group Theory

Scientific paper

In this article, we study eigenvalue functions of varying transition probability matrices on finite, vertex transitive graphs. We prove that the eigenvalue function of an eigenvalue of fixed higher multiplicity has a critical point if and only if the corresponding spectral representation is equilateral. We also show how the geometric realisation of a finite Coxeter group as a reflection group can be used to obtain an explicit orthogonal system of eigenfunctions. Combining both results, we describe the behaviour of the spectral representations of the second highest eigenvalue function under the change of the transition probabilities in the case of Archimedean solids.

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