Zero-Tension and the Inverse Problem: Reading the Hidden Cause from a Perfect Null — The Reversible Reference Layer and Inverse Scattering.
Zero-Tension is a stance the author inherited from the masters of Japanese fishing, but its true meaning goes beyond feeling the target’s bite. The master imprints the state of NO-bite (the null) perfectly into himself: where a beginner asks directly “what is a bite?”, the master learns the opposite — the no-response baseline — to the extreme, so that every deviation from it stands out as the whereabouts of a hidden cause. This is the stance of the INVERSE PROBLEM: not modeling the positive signal directly, but establishing a perfect reference (null) and inferring the hidden cause from deviations against it. This paper gives that intuition a royal-road home. The perfect reference, in physics, is the reversible, dissipation-free free dynamics — the free Hamiltonian H0, preserving phase-space volume (Liouville, Paper 77) and the symplectic form (Paper 76): literally the zero-tension baseline. Friction/resistance (Paper 78) and scattering (from an interaction V) are both deviations from this reference, and the deviation carries the cause. The inverse scattering problem (Gel’fand–Levitan–Marchenko) is precisely the sharpening of this stance: know the free evolution perfectly, and recover the hidden potential V from the scattering deviation. So Zero-Tension lives in the inverse-problem stance: master the reversible reference layer as a perfect null, and read the hidden cause from its deviations. IMPORTANT (scope): this is a placement of interpretation and naming (Layer 2); no new mathematics and no new prediction; mechanics is not modified and no new inverse-problem theorem is claimed. The fishing masters’ technique, the “Universe OS,” and the author’s felt kinship with the inverse problem of wave scattering (a personal connection to Prof. Kimura’s inverse-problem thinking at Kobe University) are Layer-3 non-science lenses; what is certain is only the reversible reference layer and the standard inverse problem.
On the making of this work: The ideas and content of this work stem from the author’s own considerations. Assistance from an AI (a large language model) was used for structuring, English translation, and checking the algebra. Any remaining errors or misinterpretations are solely the author’s. Feedback and corrections are sincerely appreciated.
Reference
Yamagishi, Y. (2026). Zero-Tension and the Inverse Problem [Paper 89]. Zenodo.
DOI: 10.5281/zenodo.21748664
ORCID: 0009-0006-8587-3450