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2010 Localization for $(1+1)$-dimensional pinning models with $(\nabla + \Delta)$-interaction
Francesco Caravenna, Martin Borecki
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Electron. Commun. Probab. 15: 534-548 (2010). DOI: 10.1214/ECP.v15-1584


We study the localization/delocalization phase transition in a class of directed models for a homogeneous linear chain attracted to a defect line. The self-interaction of the chain is of mixed gradient and Laplacian kind, whereas the attraction to the defect line is of $\delta$-pinning type, with strength $\epsilon \ge 0$. It is known that, when the self-interaction is purely Laplacian, such models undergo a non-trivial phase transition: to localize the chain at the defect line, the reward $\epsilon$ must be greater than a strictly positive critical threshold $\epsilon_c > 0$. On the other hand, when the self-interaction is purely gradient, it is known that the transition is trivial: an arbitrarily small reward $\epsilon > 0$ is sufficient to localize the chain at the defect line ($\epsilon_c = 0$). In this note we show that in the mixed gradient and Laplacian case, under minimal assumptions on the interaction potentials, the transition is always trivial, that is $\epsilon_c = 0$.


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Francesco Caravenna. Martin Borecki. "Localization for $(1+1)$-dimensional pinning models with $(\nabla + \Delta)$-interaction." Electron. Commun. Probab. 15 534 - 548, 2010.


Accepted: 2 November 2010; Published: 2010
First available in Project Euclid: 6 June 2016

zbMATH: 1225.60150
MathSciNet: MR2737711
Digital Object Identifier: 10.1214/ECP.v15-1584

Primary: 60K35
Secondary: 60J05 , 82B41

Keywords: Free energy , Gradient Interaction , Laplacian Interaction , Linear Chain Model , Localization Phenomena , Markov chain , phase transition , pinning model , Polymer model

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