2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/36069If universal quantum interaction is really connected with the coset structure of deformations of quantum states then the curvature of projective Hilbert state space should be observable. I discuss some approach to the measurement of curvature-dependent values.16 pages, LateXGeneral Relativity and Quantum Cosmologytext