Modern Koopman theory for dynamical systems

SL Brunton, M Budišić, E Kaiser, JN Kutz - arxiv preprint arxiv:2102.12086, 2021 - arxiv.org
The field of dynamical systems is being transformed by the mathematical tools and
algorithms emerging from modern computing and data science. First-principles derivations …

Beyond expectations: residual dynamic mode decomposition and variance for stochastic dynamical systems

MJ Colbrook, Q Li, RV Raut, A Townsend - Nonlinear Dynamics, 2024 - Springer
Koopman operators linearize nonlinear dynamical systems, making their spectral
information of crucial interest. Numerous algorithms have been developed to approximate …

Overcoming the timescale barrier in molecular dynamics: Transfer operators, variational principles and machine learning

C Schütte, S Klus, C Hartmann - Acta Numerica, 2023 - cambridge.org
One of the main challenges in molecular dynamics is overcoming the 'timescale barrier': in
many realistic molecular systems, biologically important rare transitions occur on timescales …

Propofol anesthesia destabilizes neural dynamics across cortex

AJ Eisen, L Kozachkov, AM Bastos, JA Donoghue… - Neuron, 2024 - cell.com
Every day, hundreds of thousands of people undergo general anesthesia. One hypothesis is
that anesthesia disrupts dynamic stability—the ability of the brain to balance excitability with …

Koopman-theoretic modeling of quasiperiodically driven systems: Example of signalized traffic corridor

S Das, S Mustavee, S Agarwal… - IEEE Transactions on …, 2023 - ieeexplore.ieee.org
This article presents a novel approach to analyzing quasiperiodically driven dynamical
systems. It presents a holistic data-driven framework for reconstructing such a system and …

Non-stationary dynamic mode decomposition

J Ferré, A Rokem, EA Buffalo, JN Kutz, A Fairhall - IEEE Access, 2023 - ieeexplore.ieee.org
Many physical processes display complex high-dimensional time-varying behavior, from
global weather patterns to brain activity. An outstanding challenge is to express high …

Koopman-based spectral clustering of directed and time-evolving graphs

S Klus, N Djurdjevac Conrad - Journal of nonlinear science, 2023 - Springer
While spectral clustering algorithms for undirected graphs are well established and have
been successfully applied to unsupervised machine learning problems ranging from image …

On the lifting and reconstruction of nonlinear systems with multiple invariant sets

S Pan, K Duraisamy - Nonlinear Dynamics, 2024 - Springer
The Koopman operator provides a linear perspective on non-linear dynamics by focusing on
the evolution of observables in an invariant subspace. Observables of interest are typically …

Data-driven acoustic control of a spherical bubble using a Koopman linear quadratic regulator

AJ Gibson, XC Yee, ML Calvisi - The Journal of the Acoustical Society …, 2024 - pubs.aip.org
Koopman operator theory has gained interest as a framework for transforming nonlinear
dynamics on the state space into linear dynamics on abstract function spaces, which …

Optimizing deep brain stimulation based on isostable amplitude in essential tremor patient models

B Duchet, G Weerasinghe, C Bick… - Journal of neural …, 2021 - iopscience.iop.org
Objective. Deep brain stimulation is a treatment for medically refractory essential tremor. To
improve the therapy, closed-loop approaches are designed to deliver stimulation according …