2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/201530We present an axiomatic modification of quaternionic quantum mechanics with a possible-worlds semantics capable of predicting essential "nonquantum" features of an observable universe model - the dimensionality and topology of spacetime, the existence, the signature and a specific form of a metric on it, and certain naturally distinguished directions (vistas) in spacetime unrelated to its metric properties.Final version published in IJTP under the title "GR-friendly description of quantum systems"Mathematical PhysicsAstrophysicsGeneral Relativity and Quantum CosmologyDifferential GeometryQuantum Physics81P10; 83F05 (primary), 53Z05; 53A17 (secondary)text