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A random energy model for size dependence: recurrence vs. transience
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  • Published: June 1998

A random energy model for size dependence: recurrence vs. transience

  • Christof Külske1 

Probability Theory and Related Fields volume 111, pages 57–100 (1998)Cite this article

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Summary.

We investigate the size dependence of disordered spin models having an infinite number of Gibbs measures in the framework of a simplified `random energy model for size dependence'. We introduce two versions (involving either independent random walks or branching processes), that can be seen as generalizations of Derrida's random energy model. Our model is shown to exhibit a recurrence/transience transition for Gibbs measures (meaning: a.s. existence/nonexistence of subsequences of volumes converging to a given random infinite volume state), depending on the growthrate of a function M N describing the `number of extremal Gibbs states that can be observed in a finite volume N'. We investigate the model in detail in the `critical regime' M N ∼(log N)p (with critical point p=1). We obtain the a.s. large volume asymptotics of the relative weights for finding a particular state and we compute the set of a.s. cluster points of the corresponding occupation times (corresponding to the `empirical metastate'). In the course of the proof we obtain Laws of the Iterated Logarithm for the pair X N ν,Y N ν μ=1,2,…, MN;μ≠νX N μ where (X N μ)μ=1,…, M N ;N=1,2,… is either a branching random walk or a collection of random walks, independent over μ.

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Authors and Affiliations

  1. Courant Institute, 251 Mercer Street, New York, NY 10012-1185, USA e-mail: kuelske@wias-berlin.de, kuelske@cims.nyu.edu, , , , , , US

    Christof Külske

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  1. Christof Külske
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Received: 28 July 1997 / In revised form: 9 December 1997

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Külske, C. A random energy model for size dependence: recurrence vs. transience. Probab Theory Relat Fields 111, 57–100 (1998). https://doi.org/10.1007/s004400050162

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  • Issue Date: June 1998

  • DOI: https://doi.org/10.1007/s004400050162

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  • Mathematics Subject Classification (1991): 82B44
  • 60G70
  • 60J15
  • 60J80
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