Coherence-Driven Cosmology: A Quantum Informational Approach to Late-Time Expansion and the Hubble Tension

This work introduces a coherence-driven cosmological framework in which late-time cosmic expansion is interpreted as a manifestation of underlying informational dynamics rather than an additional energy component. Motivated by recent developments in quantum information theory, holography, and quantum error correction, the model proposes a dynamical coherence regulator λ (z) that encodes the capacity of the universe to preserve relational structure under evolution. The effective expansion rate is modified according to: Hₑff (z) = H_ΛCDM (z) 1 + γ λ (z), with λ (z) constructed to vanish at high redshift and emerge dynamically at late times. This ensures full consistency with early-universe constraints while allowing for controlled deviations from ΛCDM in the recent cosmological epoch. A key result is that the model naturally produces a smooth enhancement of the expansion rate at low redshift, providing a potential resolution to the Hubble tension without modifying primordial physics. A calibrated realization demonstrates that the observed shift in the Hubble constant (from ~68. 5 to ~73 km/s/Mpc) can be reproduced through coherence dynamics alone. Beyond its phenomenological implications, this framework suggests a conceptual shift in which cosmological dynamics are governed not only by matter and energy, but also by the evolution of coherence in an underlying informational substrate. The proposed model provides testable predictions, including redshift-dependent deviations from ΛCDM, parameter degeneracies controlled by γλ₀, and potential observational signatures in structure formation and quantum field processes. This work is part of the broader 2PS (Two-Phase System) framework, which explores coherence as a fundamental organizing principle of physical reality.