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The Tensor-Network Kinetic Solver - Classical, Deployable Today

Authors: Ford, P. I.

Summary

The kinetic distribution function is highly compressible in a low-rank tensor-network representation, and that yields a practical classical solver, not a storage trick. On a 1D1V BGK test, a matrix-product-state truncation reaches relative-L² error 2×10−⁴ at rank 8 using ~0.19× the dense storage, with the error falling exponentially in rank. Unlike the fault-tolerant-horizon quantum route, this runs today.

Canonical records

What's in this repository

  • *_Editorial_2026.pdf — the editorial edition of the paper.
  • *_reproducibility_bundle.zip — the reproducibility bundle: toolkit source, the per-gate runs the paper cites, and a student pack (concept notes, tutorial, glossary, reproduce.ipynb, requirements.txt).

Reproduce

unzip *_reproducibility_bundle.zip -d bundle && cd bundle
pip install -r requirements.txt
jupyter notebook reproduce.ipynb

Scope

Physics and engineering only; no economics. Every quantity traces to a documented gate in the KRONOS de-risking register. Honest gates are stated in the paper.

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