The Origins of Quantum Reality: Deriving Spin, Decoherence, and the Born Rule from a (3,3) Spacetime Geometry

The differing treatments of time in general relativity and quantum mechanics present a significant challenge to a unified theory of physics. This work suggests that the flow of time is not a fundamental property of the universe, but rather an emergent geometric consequence of quantum decoherence. We propose a six-dimensional, pseudo-Riemannian spacetime with a (3,3) metric signature as the fundamental arena of physics. We suggest that the objective, physical inscription of correlation information between a system and its environment acts as a local source for the curvature of the temporal dimensions, much as mass acts as a source for the curvature of spacetime. The forward march of time is, in this view, the universe continuously writing its history into the geometry of the present moment. This framework provides a geometric origin for intrinsic quantum spin and for the branching of worlds in the Many-Worlds Interpretation. Historical paradoxes of multi-time theories (Ostrogradsky instabilities) are addressed by a Causal Gauge Principle, implemented via a geometric Lee-Wick mechanism. The theory offers a distinct, falsifiable prediction: a specific, non-exponential signature in the decay of metastable particles, caused by their traversing longer paths through the temporal dimensions. This work presents a mathematically consistent and experimentally testable foundation for further inquiry. --- 43 pages, 5 figures. The comprehensive manuscript, including full supplementary information and appendices. This work has been submitted to Physical Review X.© 2025 AetherVision, LLC & Sunil Kukreja. All rights reserved.