Mathematics – Probability
Scientific paper
2010-08-11
Mathematics
Probability
24 pages. To appear in European J. Comb. (special issue on graph limits)
Scientific paper
What does an Erdos-Renyi graph look like when a rare event happens? This paper answers this question when p is fixed and n tends to infinity by establishing a large deviation principle under an appropriate topology. The formulation and proof of the main result uses the recent development of the theory of graph limits by Lovasz and coauthors and Szemeredi's regularity lemma from graph theory. As a basic application of the general principle, we work out large deviations for the number of triangles in G(n,p). Surprisingly, even this simple example yields an interesting double phase transition.
Chatterjee Sourav
Varadhan S. R. S.
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