Author

Rachel Morris

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Preprint Sep 2026

Finite-Data Error Bounds for Approximating the Koopman Operator: Sampling Measures, Super-Polynomial Convergence and Regularization

The Koopman operator is a well-established framework for lifting nonlinear dynamical systems to an infinite-dimensional space where dynamics are linear. Extended Dynamic Mode Decomposition (EDMD) is a widely used method in data-driven dynamics as it provides a Galerkin approximation of the Koopman operator on the finit...

D. Fassler, Rachel Morris, Jason J. Bramburger et al. · 0 citations

Preprint Sep 2026

The Spectral Skeleton of Chaos: Koopman Wave Packets on Poincar\'e Sections

A Poincar\'e section replaces a flow by a return map, but for a chaotic system this map is usually known only from sampled crossings. We show that coarse transport can be read directly from Koopman spectral data, without fitting the map. Measure-preserving EDMD retains the isometric structure; riggedDMD then approximat...

Jason J. Bramburger, Shiloh-Sheray Gagnon, Rachel Morris et al. · 0 citations

Open access Aug 2026

High-throughput screening in hiPSC-cardiac models reveals cardiomyocyte-specific cell cycle regulatory mechanisms

A dual-reporter and a high-throughput image-based pipeline are developed and a cardiomyocyte-selective pro-proliferative compound is identified as GDC-0339, uncovering cardiomyocyte-specific mechanisms governing the cell cycle that are potentially druggable.

Francesca Butera, Bryce Hassett, Rachel Morris et al. · bioRxiv · 0 citations