CMG-LCE V7: Dynamic Vacuum Coherence and the Emergence of a Time-Dependent Cosmological Term

This preprint extends the CMG–LCE (Cosmología Magnetogravitacional – Coherence–Energy Law) framework by introducing a dynamical formulation of vacuum coherence across cosmological scales. Within this approach, spacetime geometry is treated as an emergent response to the coupling between electromagnetic field coherence and a nonlocal vacuum memory field Ψ, previously shown to reproduce galactic rotation curves, cluster dynamics, and gravitational lensing without invoking non-baryonic dark matter. The work derives the cosmological evolution of the coherence field Ψ and shows that its dynamics naturally generate an effective, time-dependent cosmological term Λ(t), without introducing additional scalar fields or exotic matter components. In high-coherence regimes, the framework admits a phase of accelerated expansion with inflation-like behavior, while coherence loss driven by intense electromagnetic activity leads to a local suppression of Λ, consistent with environmental trends identified in recent large-scale structure and AGN feedback observations. The scope of this preprint is deliberately limited. It does not propose a complete alternative cosmological model nor a replacement for ΛCDM. Instead, it focuses on a specific physical mechanism—the dynamical evolution of vacuum coherence—and derives falsifiable predictions for cosmic microwave background anisotropies, late-time expansion histories, and environmental variations of the cosmological term. Extended mathematical derivations, phenomenological analyses, and compatibility discussions with quantum field theory are provided as supplementary materials.