Translational Invariance and Spectral Objectivity
Translational Invariance and Spectral Objectivity I have uploaded a new working paper to Zenodo: Gustaf Ullman, Translational Invariance and Spectral Objectivity: Plancherel--Parseval and Uncertainty under a Unitary Shift Representation Zenodo DOI: 10.5281/zenodo.20355992 What the paper is about The paper examines translational invariance as a minimal model of what I call observer equivariance . In ordinary physics, translational invariance is usually understood as invariance under shifts in physical space. If a law is valid here , it should also be valid there . The mathematical form of the law should not depend on the arbitrary choice of origin. The paper asks what happens if this idea is abstracted. Instead of treating translations only as displacements in physical space, we may treat them as shifts between observer perspectives. A group of shifts acts on a space of perspectives, and objective structure is then understood as what remains stable under these shi...