We demonstrate that when absolute unitary evolution of the wavefunction is enforced alongside the requirement of a single, self-consistent world, the standard quantum measurement problem dissolves. The resulting framework, Relational Retrocausal Quantum Mechanics (RRQM), requires that the state of any system is strictly relational, and that measurement retroactively rewrites the entire history of the wavefunction. By extending RRQM to incorporate Quantum Reference Frames (QRFs) and mapping them onto a doubly non-commutative phase-space matrix algebra, we derive exact continuous causality. We prove that the spatial (Xµ,Xν = iθµν) and momentum (Pµ,Pν = iBµν) non-commutativities dynamically deform the phase-space integration measure. This rigidity generates localized geometric stress upon measurement, mathematically inducing the non-linear curvature of the Einstein-Hilbert action. Furthermore, we provide a complete algebraic derivation proving that gravitational binding energy—the classical mass defect—emerges purely from the relational interaction between non-commutative momentum operators, establishing macroscopic gravity as a thermodynamic shadow of retrocausal constraints.
Ahmed Albezawi (2026) studied this question.