Global existence and non-uniqueness for 3D Navier–Stokes equations with space-time white noise

M Hofmanová, R Zhu, X Zhu - Archive for Rational Mechanics and …, 2023 - Springer
We establish that global-in-time existence and non-uniqueness of probabilistically strong
solutions to the three dimensional Navier–Stokes system driven by space-time white noise …

Geometric stochastic heat equations

Y Bruned, F Gabriel, M Hairer, L Zambotti - Journal of the American …, 2022 - ams.org
We consider a natural class of ${\mathbf {R}}^ d $-valued one-dimensional stochastic partial
differential equations (PDEs) driven by space-time white noise that is formally invariant …

Large N Limit of the O(N) Linear Sigma Model in 3D

H Shen, R Zhu, X Zhu - Communications in Mathematical Physics, 2022 - Springer
In this paper we study the large N limit of the O (N)-invariant linear sigma model, which is a
vector-valued generalization of the Φ 4 quantum field theory, on the three dimensional torus …

A stochastic analysis approach to lattice Yang–Mills at strong coupling

H Shen, R Zhu, X Zhu - Communications in Mathematical Physics, 2023 - Springer
We develop a new stochastic analysis approach to the lattice Yang–Mills model at strong
coupling in any dimension d> 1, with t'Hooft scaling β N for the inverse coupling strength. We …

Singular HJB equations with applications to KPZ on the real line

X Zhang, R Zhu, X Zhu - Probability Theory and Related Fields, 2022 - Springer
This paper is devoted to studying Hamilton-Jacobi-Bellman equations with distribution-
valued coefficients, which are not well-defined in the classical sense and are understood by …

Large N limit of the O (N) linear sigma model via stochastic quantization

H Shen, SA Smith, R Zhu, X Zhu - The Annals of Probability, 2022 - projecteuclid.org
Large N limit of the O(N) linear sigma model via stochastic quantization Page 1 The Annals of
Probability 2022, Vol. 50, No. 1, 131–202 https://doi.org/10.1214/21-AOP1531 © Institute of …

Large limit and expansion of invariant observables in linear -model via SPDE

H Shen, R Zhu, X Zhu - arXiv preprint arXiv:2306.05166, 2023 - arxiv.org
In this paper, we continue the study of large $ N $ problems for the Wick renormalized linear
sigma model, ie $ N $-component $\Phi^ 4$ model, in two spatial dimensions, using …

Stochastic Ricci flow on compact surfaces

J Dubédat, H Shen - International Mathematics Research …, 2022 - academic.oup.com
In this paper we introduce the stochastic Ricci flow (SRF) in two spatial dimensions. The flow
is symmetric with respect to a measure induced by Liouville conformal field theory. Using the …

Stochastic heat equations for infinite strings with values in a manifold

X Chen, B Wu, R Zhu, X Zhu - Transactions of the American Mathematical …, 2021 - ams.org
In the paper, we construct conservative Markov processes corresponding to the martingale
solutions to the stochastic heat equation on $\mathbb {R}^+ $ or $\mathbb {R} $ with values …

On ergodic invariant measures for the stochastic Landau-Lifschitz-Gilbert equation in 1D

E Gussetti - arXiv preprint arXiv:2208.02136, 2022 - arxiv.org
We establish existence of an ergodic invariant measure on $ H^ 1 (D,\mathbb {R}^ 3)\cap L^
2 (D,\mathbb {S}^ 2) $ for the stochastic Landau-Lifschitz-Gilbert equation on a bounded one …