Abstract
One of the fundamental properties of a graph is the number of distinct eigenvalues of its adjacency or Laplacian matrix. Determining this number is of theoretical interest and also of practical impact. Graphs with small spectra exhibit many symmetry properties and are well suited as interconnection topologies. Es- pecially load balancing can be done on such interconnection topologies in a small number of steps. In this paper we are interested in graphs with maximal degree O(log n), where n is the number of vertices, and with a small number of distinct eigenvalues. Our goal is to find scalable families of such graphs with polyloga- rithmic spectrum in the number of vertices. We present also the eigenvalues of the Butterfly graph.
This work was partially supported by the German Research Association (DFG) within the SFB 376 “Massive Parallelität: Algorithmen, Entwurfsmethoden, Anwendungen”.
The research was done while the second author was visiting the Department of Mathematics and Computer Science at the University of Paderborn.
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Elsässer, R., Královič, R., Monien, B. (2001). Scalable Sparse Topologies with Small Spectrum. In: Ferreira, A., Reichel, H. (eds) STACS 2001. STACS 2001. Lecture Notes in Computer Science, vol 2010. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-44693-1_19
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DOI: https://doi.org/10.1007/3-540-44693-1_19
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