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July 2012 Universality in one-dimensional hierarchical coalescence processes
Alessandra Faggionato, Fabio Martinelli, Cyril Roberto, Cristina Toninelli
Ann. Probab. 40(4): 1377-1435 (July 2012). DOI: 10.1214/11-AOP654


Motivated by several models introduced in the physics literature to study the nonequilibrium coarsening dynamics of one-dimensional systems, we consider a large class of “hierarchical coalescence processes” (HCP). An HCP consists of an infinite sequence of coalescence processes $\{\xi^{(n)}(\cdot)\}_{n\ge1}$: each process occurs in a different “epoch” (indexed by $n$) and evolves for an infinite time, while the evolution in subsequent epochs are linked in such a way that the initial distribution of $\xi^{(n+1)}$ coincides with the final distribution of $\xi^{(n)}$. Inside each epoch the process, described by a suitable simple point process representing the boundaries between adjacent intervals (domains), evolves as follows. Only intervals whose length belongs to a certain epoch-dependent finite range are active, that is, they can incorporate their left or right neighboring interval with quite general rates. Inactive intervals cannot incorporate their neighbors and can increase their length only if they are incorporated by active neighbors. The activity ranges are such that after a merging step the newly produced interval always becomes inactive for that epoch but active for some future epoch.

Without making any mean-field assumption we show that: (i) if the initial distribution describes a renewal process, then such a property is preserved at all later times and all future epochs; (ii) the distribution of certain rescaled variables, for example, the domain length, has a well-defined and universal limiting behavior as $n\to\infty$ independent of the details of the process (merging rates, activity ranges, …). This last result explains the universality in the limiting behavior of several very different physical systems (e.g., the East model of glassy dynamics or the Paste-all model) which was observed in several simulations and analyzed in many physics papers. The main idea to obtain the asymptotic result is to first write down a recursive set of nonlinear identities for the Laplace transforms of the relevant quantities on different epochs and then to solve it by means of a transformation which in some sense linearizes the system.


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Alessandra Faggionato. Fabio Martinelli. Cyril Roberto. Cristina Toninelli. "Universality in one-dimensional hierarchical coalescence processes." Ann. Probab. 40 (4) 1377 - 1435, July 2012.


Published: July 2012
First available in Project Euclid: 4 July 2012

zbMATH: 1264.60033
MathSciNet: MR2978129
Digital Object Identifier: 10.1214/11-AOP654

Primary: 60B10, 60G55, 82C24

Rights: Copyright © 2012 Institute of Mathematical Statistics


Vol.40 • No. 4 • July 2012
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