Regular Article: The Diameter of Sparse Random Graphs

  • Authors:
  • Fan Chung;Linyuan Lu

  • Affiliations:
  • Department of Mathematics, University of California, San Diego, La Jolla, California, 92093;Department of Mathematics, University of California, San Diego, La Jolla, California, 92093

  • Venue:
  • Advances in Applied Mathematics
  • Year:
  • 2001

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Abstract

We consider the diameter of a random graph G(n,p) for various ranges of p close to the phase transition point for connectivity. For a disconnected graph G, we use the convention that the diameter of G is the maximum diameter of its connected components. We show that almost surely the diameter of random graph G(n,p) is close to lognlog(np) if np-~. Moreover if nplogn=c8, then the diameter of G(n,p) is concentrated on two values. In general, if nplogn=cc"0, the diameter is concentrated on at most 2@?1/c"0@?+4 values. We also proved that the diameter of G(n,p) is almost surely equal to the diameter of its giant component if np3.6.