The Annals of Probability

Domination by product measures

T. M. Liggett, R. H. Schonmann, and A. M. Stacey

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Abstract

4 We consider families of {0, 1}-valued random variables indexed by the vertices of countable graphs with bounded degree. First we show that if these random variables satisfy the property that conditioned on what happens outside of the neighborhood of each given site, the probability of seeing a 1 at this site is at least a value $p$ which is large enough, then this random field dominates a product measure with positive density. Moreover the density of this dominated product measure can be made arbitrarily close to 1, provided that $p$ is close enough to 1. Next we address the issue of obtaining the critical value of $p$, defined as the threshold above which the domination by positive-density product measures is assured. For the graphs which have as vertices the integers and edges connecting vertices which are separated by no more than $k$ units, this critical value is shown to be $1 - k^k /(k + 1)^{k+1}$, and a discontinuous transition is shown to occur. Similar critical values of $p$ are found for other classes of probability measures on ${0, 1}^{\mathbb{Z}}$. For the class of $k$-dependent measures the critical value is again $1 - k^k /(k + 1)^{k+1}$, with a discontinuous transition. For the class of two-block factors the critical value is shown to be 1/2 and a continuous transition is shown to take place in this case. Thus both the critical value and the nature of the transition are different in the two-block factor and 1-dependent cases.

Article information

Source
Ann. Probab., Volume 25, Number 1 (1997), 71-95.

Dates
First available in Project Euclid: 18 June 2002

Permanent link to this document
https://projecteuclid.org/euclid.aop/1024404279

Digital Object Identifier
doi:10.1214/aop/1024404279

Mathematical Reviews number (MathSciNet)
MR1428500

Zentralblatt MATH identifier
0882.60046

Subjects
Primary: 60G60: Random fields 60G10: Stationary processes
Secondary: 60K35: Interacting random processes; statistical mechanics type models; percolation theory [See also 82B43, 82C43]

Keywords
Stochastic domination random fields product measures critical points rescaling

Citation

Liggett, T. M.; Schonmann, R. H.; Stacey, A. M. Domination by product measures. Ann. Probab. 25 (1997), no. 1, 71--95. doi:10.1214/aop/1024404279. https://projecteuclid.org/euclid.aop/1024404279


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  • LOS ANGELES, CALIFORNIA 90024 E-MAIL: tml@math.ucla.edu rhs@math.ucla.edu stacey@math.ucla.edu