Permanent URL to this publication: http://dx.doi.org/10.5167/uzh-21926
Bolthausen, E (2002). Localization-delocalization phenomena for random interfaces. In: Tatsien, L. Proceedings of the International Congress of Mathematicians, Vol. III (Beijing, 2002). Beijing, 25-39. ISBN 7-04-008690-5.
We consider d-dimensional random surface models which for d=1 are the standard (tied-down) random walks (considered as a random ``string''). In higher dimensions, the one-dimensional (discrete) time parameter of the random walk is replaced by the d-dimensional lattice ^d, or a finite subset of it. The random surface is represented by real-valued random variables _i, where i is in ^d. A class of natural generalizations of the standard random walk are gradient models whose laws are (formally) expressed as
P(d) = 1/Z [-_V(_i-_j)] _i d_i,
V: -> R^+ convex, and with some growth conditions. Such surfaces have been
introduced in theoretical physics as (simplified) models for random interfaces separating different phases. Of particular interest are localization-delocalization phenomena, for instance for a surface interacting with a wall by attracting or repulsive interactions, or both together. Another example are so-called heteropolymers which have a noise-induced interaction. Recently, there had been developments of new probabilistic tools for such problems. Among them are: o Random walk representations of Helffer-Sjöstrand type, o Multiscale analysis, o Connections with random trapping problems and large deviations We give a survey of some of these developments.
|Item Type:||Book Section, refereed, original work|
|Communities & Collections:||07 Faculty of Science > Institute of Mathematics|
|Uncontrolled Keywords:||random string; lattice; gradient model|
|Deposited On:||27 Apr 2010 08:34|
|Last Modified:||09 Jul 2012 05:56|
|Publisher:||Higher Education Press|
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