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research article

A scaling limit of the 2D parabolic Anderson model with exclusion interaction

Erhard, Dirk
•
Hairer, Martin  
•
Xu, Tiecheng
January 1, 2025
Electronic Communications in Probability

We consider the (discrete) parabolic Anderson model ∂u(t, x)/∂t = ∆u(t, x) + ξt(x)u(t, x), t ≥ 0, x ∈ Z d. Here, the ξ-field is R-valued, acting as a dynamic random environment, and ∆ represents the discrete Laplacian. We focus on the case where ξ is given by a rescaled symmetric simple exclusion process which converges to an Ornstein-Uhlenbeck process. By scaling the Laplacian diffusively and considering the equation on a torus, we demonstrate that in dimension d = 2, when a suitably renormalized version of the above equation is considered, the sequence of solutions converges in law. This resolves an open problem from [5], where a similar result was shown in the three-dimensional case. The novel contribution in the present work is the establishment of a gradient bound on the transition probability of a fixed but arbitrary number of labelled exclusion particles.

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Type
research article
DOI
10.1214/25-ecp674
Author(s)
Erhard, Dirk

Universidade Fedral da Bahia, Brazil

Hairer, Martin  

École Polytechnique Fédérale de Lausanne

Xu, Tiecheng

Universidade Federal da Bahia, Brazil

Date Issued

2025-01-01

Publisher

Institute of Mathematical Statistics

Published in
Electronic Communications in Probability
Volume

30

Issue

none

Subjects

simple exclusion process

•

parabolic Anderson model

•

stochastic PDE. MSC2020 subject classifications: 60K35

•

60L30

•

60H15

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
PROPDE  
Available on Infoscience
April 14, 2025
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/249219
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