Weighted expanders and the anisotropic Alon-Boppana theorem

  • Authors:
  • Tullio Ceccherini-Silberstein;Fabio Scarabotti;Filippo Tolli

  • Affiliations:
  • Facoltà di Ingegneria, Università del Sannio, C.so Garibaldi, 82100 Benevento, Italy;Dipartimento Me.Mo.Mat., Università di Roma "La Sapienza", Via A. Scarpa 8, 00185 Roma, Italy;Dipartimento di Matematica, Università di Roma 3, Via S. Pincherle, 00100 Roma, Italy

  • Venue:
  • European Journal of Combinatorics
  • Year:
  • 2004

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Abstract

We present the anisotropic version of the classical Alon-Boppana theorem on the asymptotic spectrum of random walks on infinite families of graphs. The relations to the Grigorchuk-Zuk theory--on the space of graphs with uniformly bounded degree and the continuity of the spectral measure of Markov operators related to the Alon-Boppana theorem and the Burger-Greenberg-Serre theorem--are also indicated.