A robust second-order low-rank BUG integrator based on the midpoint rule

G Ceruti, L Einkemmer, J Kusch, C Lubich - BIT Numerical Mathematics, 2024 - Springer
Dynamical low-rank approximation has become a valuable tool to perform an on-the-fly
model order reduction for prohibitively large matrix differential equations. A core ingredient …

A review of low-rank methods for time-dependent kinetic simulations

L Einkemmer, K Kormann, J Kusch… - arXiv preprint arXiv …, 2024 - arxiv.org
Time-dependent kinetic models are ubiquitous in computational science and engineering.
The underlying integro-differential equations in these models are high-dimensional …

[HTML][HTML] Accelerating the simulation of kinetic shear Alfvén waves with a dynamical low-rank approximation

L Einkemmer - Journal of Computational Physics, 2024 - Elsevier
We propose a dynamical low-rank algorithm for a gyrokinetic model that is used to describe
strongly magnetized plasmas. The low-rank approximation is based on a decomposition into …

[HTML][HTML] A low-rank complexity reduction algorithm for the high-dimensional kinetic chemical master equation

L Einkemmer, J Mangott, M Prugger - Journal of Computational Physics, 2024 - Elsevier
It is increasingly realized that taking stochastic effects into account is important in order to
study biological cells. However, the corresponding mathematical formulation, the chemical …

A hierarchical dynamical low-rank algorithm for the stochastic description of large reaction networks

L Einkemmer, J Mangott, M Prugger - arXiv preprint arXiv:2407.11792, 2024 - arxiv.org
The stochastic description of chemical reaction networks with the kinetic chemical master
equation (CME) is important for studying biological cells, but it suffers from the curse of …

A multi-fidelity adaptive dynamical low-rank based optimization algorithm for fission criticality problems

C Scalone, L Einkemmer, J Kusch… - arXiv preprint arXiv …, 2024 - arxiv.org
Computing the dominant eigenvalue is important in nuclear systems as it determines the
stability of the system (ie whether the system is sub or supercritical). Recently, the work of …

Reduced Augmentation Implicit Low-rank (RAIL) integrators for advection-diffusion and Fokker-Planck models

J Nakao, JM Qiu, L Einkemmer - arXiv preprint arXiv:2311.15143, 2023 - arxiv.org
This paper introduces a novel computational approach termed the Reduced Augmentation
Implicit Low-rank (RAIL) method by investigating two predominant research directions in low …

Full-rank and low-rank splitting methods for the Swift–Hohenberg equation

YL Zhao, M Li - Communications in Nonlinear Science and Numerical …, 2023 - Elsevier
Abstract The Swift–Hohenberg (SH) equation is an important model in the study of pattern
formation. In this paper, we propose two full-rank splitting schemes and a low-rank …

The impossible challenge of estimating non-existent moments of the Chemical Master Equation

V Wagner, N Radde - Bioinformatics, 2023 - academic.oup.com
Abstract Motivation The Chemical Master Equation (CME) is a set of linear differential
equations that describes the evolution of the probability distribution on all possible …

Automatic partitioning for the low-rank integration of stochastic Boolean reaction networks

L Einkemmer, J Mangott, M Prugger - arXiv preprint arXiv:2501.04157, 2025 - arxiv.org
Boolean reaction networks are an important tool in biochemistry for studying mechanisms in
the biological cell. However, the stochastic formulation of such networks requires the …