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Growth of the Number of Spanning Trees of the Erdős–Rényi Giant Component

Published online by Cambridge University Press:  01 September 2008

RUSSELL LYONS ,
RON PELED  and
ODED SCHRAMM
RUSSELL LYONS
Affiliation:
Department of Mathematics, Indiana University, Bloomington, IN 47405-5701, USA (e-mail: rdlyons@indiana.edu)
RON PELED
Affiliation:
Department of Statistics, University of California at Berkeley, 367 Evans Hall, Berkeley, CA 94720-3860, USA (e-mail: peledron@stat.berkeley.edu)
ODED SCHRAMM
Affiliation:
Microsoft Research, One Microsoft Way, Redmond, WA 98052, USA
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Abstract

The number of spanning trees in the giant component of the random graph (n, c/n) (c > 1) grows like exp{m(f(c)+o(1))} as n → ∞, where m is the number of vertices in the giant component. The function f is not known explicitly, but we show that it is strictly increasing and infinitely differentiable. Moreover, we give an explicit lower bound on f′(c). A key lemma is the following. Let PGW(λ) denote a Galton–Watson tree having Poisson offspring distribution with parameter λ. Suppose that λ*>λ>1. We show that PGW(λ*) conditioned to survive forever stochastically dominates PGW(λ) conditioned to survive forever.

Type
Paper
Information
Combinatorics, Probability and Computing , Volume 17 , Issue 5 , September 2008 , pp. 711 - 726
Copyright
Copyright © Cambridge University Press 2008

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