Trace Formulae and Spectral Statistics for Discrete Laplacians on Regular Graphs (I)

Details Trace Formulae and Spectral Statistics for Discrete Laplacians on Regular Graphs (I) Trace Formulae and Spectral Statistics for Discrete Laplacians on Regular Graphs (I)

2009-08-27

arxiv.org/abs/0908.3944v1

Physics

Mathematical Physics

22 pages, 3 figures

Scientific paper

Trace formulae for d-regular graphs are derived and used to express the spectral density in terms of the periodic walks on the graphs under consideration. The trace formulae depend on a parameter w which can be tuned continuously to assign different weights to different periodic orbit contributions. At the special value w=1, the only periodic orbits which contribute are the non back- scattering orbits, and the smooth part in the trace formula coincides with the Kesten-McKay expression. As w deviates from unity, non vanishing weights are assigned to the periodic walks with back-scatter, and the smooth part is modified in a consistent way. The trace formulae presented here are the tools to be used in the second paper in this sequence, for showing the connection between the spectral properties of d-regular graphs and the theory of random matrices.

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