Bipartite and directed scale-free complex networks arising from zeta   functions
  We construct a new class of directed and bipartite random graphs whose topology is governed by the analytic properties of L-functions. The bipartite L-graphs and the multiplicative zeta graphs are relevant examples of the proposed construction. Phase transitions and percolation thresholds for our models are determined. 
Piergiulio Tempesta
math-ph cond-mat.stat-mech math.MP math.NT