Multidimensional Random Polymers : A Renewal Approach
Abstract
In these lecture notes, which are based on the minicourse given at 2013 Prague School on Mathematical Statistical Physics, we discuss ballistic phase of quenched and annealed stretched polymers in random environment on ${\mathbb Z}^d$ with an emphasis on the natural renormalized renewal structures which appear in such models. In the ballistic regime an irreducible decomposition of typical polymers leads to an effectiverandom walk reinterpretation of the latter. In the annealed casethe OrnsteinZernike theory based on this approach paves the way to an essentially complete control on the level of local limit results and invariance principles. In the quenched case, the renewal structure maps the model of stretched polymers into an effective model of directed polymers. As a result one is able to use techniques and ideas developed in the context of directed polymers in order to address issues like strong disorder in low dimensions and weak disorder in higher dimensions. Among the topics addressed: Thermodynamics of quenched and annealed models, multidimensional renewal theory (under Cramer's condition), renormalization and effective random walk structure of annealed polymers, very weak disorder in dimensions $d\geq 4$ and strong disorder in dimensions $d=1,2$.
 Publication:

arXiv eprints
 Pub Date:
 November 2014
 arXiv:
 arXiv:1412.0229
 Bibcode:
 2014arXiv1412.0229I
 Keywords:

 Mathematics  Probability;
 Condensed Matter  Statistical Mechanics;
 Mathematical Physics;
 60K05;
 60K35;
 60K37;
 82B41;
 82D60
 EPrint:
 59 pages. Lecture Notes for 2013 Prague School