Journal
JOURNAL OF STATISTICAL PHYSICS
Volume 111, Issue 5-6, Pages 1331-1352Publisher
KLUWER ACADEMIC/PLENUM PUBL
DOI: 10.1023/A:1023012502046
Keywords
quantum graphs; line-graph; spectral statistics; semiclassical limit
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Any directed graph G with N vertices and J edges has an associated line-graph L(G) where the J edges form the vertices of L(G). We show that the non-zero eigenvalues of the adjacency matrices are the same for all graphs of such a family L-n(G). We give necessary and sufficient conditions for a line-graph to be quantisable and demonstrate that the spectra of associated quantum propagators follow the predictions of random matrices under very general conditions. Line-graphs may therefore serve as models to study the semiclassical limit (of large matrix size) of a quantum dynamics on graphs with fixed classical behaviour.
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