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November 2023 Central limit theorems for the (2+1)-dimensional directed polymer in the weak disorder limit
Simon Gabriel
Author Affiliations +
Ann. Inst. H. Poincaré Probab. Statist. 59(4): 1984-2016 (November 2023). DOI: 10.1214/22-AIHP1351

Abstract

In this article, we present an invariance principle for the paths of the directed random polymer in space dimension two in the subcritical intermediate disorder regime. More precisely, the distribution of diffusively rescaled polymer paths converges in probability to the law of Brownian motion when taking the weak disorder limit. So far analogous results have only been established for d2. Along the way, we prove a local limit theorem which allows us to factorise the point-to-point partition function of the directed polymer into a product of two point-to-plane partition functions.

Dans cet article, nous présentons un principe d’invariance pour les chemins du polymère aléatoire dirigé dans l’espace de dimension deux et dans le régime de désordre intermédiaire sous-critique. Plus précisément, la distribution des chemins de polymères sous un changement d’échelle diffusif converge en probabilité vers la loi du mouvement brownien en prenant la limite de désordre faible. Jusqu’à présent, des résultats analogues n’ont été établis que pour d2. En cours de route, nous prouvons un théorème limite local qui nous permet de factoriser la fonction de partition point à point du polymère dirigé en un produit de deux fonctions de partition point à plan.

Funding Statement

The author is supported by the Warwick Mathematics Institute Centre for Doctoral Training, and acknowledges funding from the University of Warwick and EPSRC through grant EP/R513374/1.

Acknowledgements

We thank Nikos Zygouras for suggesting the problem and much valuable advice, as well as Francesco Caravenna, Francis Comets, Dimitris Lygkonis and Rongfeng Sun for useful comments. We especially thank Stefan Junk for pointing out an error in an earlier version of the manuscript and the anonymous referees for valuable comments, that helped improving the main result to an invariance principle and simplify the presentation.

Citation

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Simon Gabriel. "Central limit theorems for the (2+1)-dimensional directed polymer in the weak disorder limit." Ann. Inst. H. Poincaré Probab. Statist. 59 (4) 1984 - 2016, November 2023. https://doi.org/10.1214/22-AIHP1351

Information

Received: 1 February 2022; Revised: 29 October 2022; Accepted: 15 November 2022; Published: November 2023
First available in Project Euclid: 3 November 2023

Digital Object Identifier: 10.1214/22-AIHP1351

Subjects:
Primary: 82D60
Secondary: 60F17 , 60K37 , 82B44

Keywords: directed polymer model , functional central limit theorem , invariance principle , local limit theorem , random environment , weak disorder

Rights: This research was funded, in whole or in part, by [EPSRC, EP/RS13374/1]. A CC BY 4.0 license is applied to this article arising from this submission, in accordance with the grant's open access conditions

Vol.59 • No. 4 • November 2023
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