Quantum coherence, internal time and contextual separation of universes

This work introduces a framework in which two universes are modeled as distinct global quantum contexts, each characterized by its own complex internal time. The boundary between them is described as a region of minimal quantum coherence, analogous to a modified vacuum in the Casimir effect. Within this configuration‑dependent complex time (CDCT) approach, coherence suppression naturally prevents causal continuity between universes while remaining fully compatible with standard quantum mechanics. The model predicts small but potentially observable deviations in vacuum fluctuations and primordial power spectra, offering a testable pathway to probe contextual structures in cosmology.