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Further Approaches of Dynamical Low-Rank Approximation for SDEs

Authors: Kazashi, Yoshihito; nobile, fabio; Zoccolan, Fabio;

Further Approaches of Dynamical Low-Rank Approximation for SDEs

Abstract

In this article, we propose two other DLRA-type dynamics for stochastic differential equations (SDEs) than the one studied in arXiv:2308.11581, derived from a minimization of functionals and (informally) from a Stratonovich formulation, respectively. The former approach resembles the DLRA for SDE system proposed in arXiv:1803.00499. Providing the differentiability of the diffusion, the latter procedure registers an additional term in the drift. Indeed, its derivation exploits the Stratonovich formulation to write stochastic processes on manifold, and, hence, possesses a term that depends on the geometry of the manifold itself. These developments open the debate on which formalism is more suitable and what DLRA for SDEs really is. MSC classes: 58J65, 60H10, 60H35, 65C30

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