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Stochastic dynamical systems developed on Riemannian manifolds

Mamajiwala, M; Roy, D; (2022) Stochastic dynamical systems developed on Riemannian manifolds. Probabilistic Engineering Mechanics , 67 , Article 103179. 10.1016/j.probengmech.2021.103179. Green open access

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Abstract

We propose a method for developing the flows of stochastic dynamical systems, posed as Ito's stochastic differential equations, on a Riemannian manifold identified through a suitably constructed metric. The framework used for the stochastic development, viz. an orthonormal frame bundle that relates a vector on the tangent space of the manifold to its counterpart in the Euclidean space of the same dimension, is the same as that used for developing a standard Brownian motion on the manifold. Mainly drawing upon some aspects of the energetics so as to constrain the flow according to any known or prescribed conditions, we show how to expediently arrive at a suitable metric, thus briefly demonstrating the application of the method to a broad range of problems of general scientific interest. These include simulations of Brownian dynamics trapped in a potential well, a numerical integration scheme that reproduces the linear increase in the mean energy of conservative dynamical systems under additive noise and non-convex optimization. The simplicity of the method and the sharp contrast in its performance vis-á-vis the correspondent Euclidean schemes in our numerical work provide a compelling evidence to its potential, especially in the context of numerical schemes for systems with the ready availability of an energy functional, e.g. those in nonlinear elasticity.

Type: Article
Title: Stochastic dynamical systems developed on Riemannian manifolds
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/j.probengmech.2021.103179
Publisher version: https://doi.org/10.1016/j.probengmech.2021.103179
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Riemannian manifold, Stochastic development, Stochastic differential equations, Non-convex optimization, Stochastic Hamiltonian systems, Trapped Brownian motion
UCL classification: UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Statistical Science
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL
URI: https://discovery.ucl.ac.uk/id/eprint/10148496
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