Coherence-Driven Cosmology: A Unified Framework for Late-Time Acceleration and Cosmological Tensions

This work introduces a coherence-driven cosmological framework in which late-time cosmic acceleration is interpreted as a manifestation of underlying informational dynamics, rather than as the effect of an additional dark-energy component. The model is motivated by recent developments in quantum information theory, holography, and quantum error correction, which suggest that the structure and evolution of physical systems may be governed by coherence-preserving principles. We formalize this idea by introducing a dynamical coherence regulator, (z), which quantifies the capacity of the universe to preserve relational structure under cosmic evolution. The expansion history is modified according toH₄₅₅ (z) = H_ (z), [1 + (z), ]with (z) constructed to vanish at high redshift, ensuring full consistency with early-universe observations such as the cosmic microwave background and baryon acoustic oscillations. Using Type Ia supernovae (Pantheon+) and BAO data, we show that the model reproduces the observed expansion history while naturally generating a late-time enhancement of the Hubble rate. This shifts the inferred value of the Hubble constant from H₀ 68. 5 to H₀ 73, km, s^-1, Mpc^{-1}, alleviating the Hubble tension without modifying primordial physics. At the level of structure formation, the same coherence mechanism induces a mild, redshift-dependent suppression in the growth-rate observable f₈ (z), improving agreement with redshift-space distortion measurements. This leads to a correlated modification of expansion and growth, providing a distinctive and testable prediction that differentiates the model from both CDM and conventional dynamical dark-energy scenarios. An effective dark-energy interpretation yields a smooth equation of state w₄₅₅ (z), with moderate phantom-like behavior at intermediate redshifts and convergence to w -1 at early and late times. The model also exhibits a characteristic degeneracy between H₀ and the coherence amplitude ₀, indicating that coherence acts as a late-time renormalization of the expansion rate. Overall, this framework provides a unified and physically motivated explanation for multiple late-time cosmological tensions, while remaining fully consistent with early-universe constraints. Its key predictions—particularly the correlated deviations in expansion and structure growth—offer clear avenues for observational testing with current and upcoming surveys. Keywords: cosmology, dark energy, Hubble tension, large-scale structure, quantum information, holography, coherence