A stochastic invariantization method for It\^o stochastic perturbations of differential equations

TL;DR

This paper introduces a stochastic invariantization method for Itô perturbations of differential equations, restoring invariance lost due to stochastic effects, and applies it to a stochastic Landau-Lifshitz equation.

Contribution

The paper proposes a novel invariantization technique for Itô stochastic perturbations and demonstrates its application to a stochastic version of the Landau-Lifshitz equation.

Findings

Restores invariance in stochastic differential equations.

Applies the method to a stochastic Landau-Lifshitz equation.

Provides a theoretical framework for stochastic invariance restoration.

Abstract

In general, adding a stochastic perturbation to a differential equation possessing an invariant manifold destroys the invariance as far as the It\^o formalism is used. In this article, we propose an invariantization method for perturbations in the It\^o case which can be used to restore invariance. We then apply our results to develop a stochastic version of the Landau-Lifshitz equation. We discuss in particular previous results obtained by Etore and al. in [P. \'Etor\'e, S.Labb\'e , J. Lelong, Long time behaviour of a stochastic nanoparticle, J. Differential Equations 257 (2014), 2115-2135].