Dimensional Fusion: Unified Origin of Mass, Time, Gravity, and the Cosmos (Theory One)

We propose a unified theory in which the observable universe emerges from an eternal one-dimensional energetic substrate through "Dynamension" — an atemporal dimensional dynamics generating colossal energy clouds. The fusion of two clouds breaks symmetry, exciting an elastic hexadimensional manifold with mixed-signature metric (+++---), governed by the free wave equation □₆ ψ = 0. Superluminal vibration induced by dimensional friction gives rise to inertial mass as crystallized persistence (m = ℏ Ω(θ)/(2c), with Ω modulated by the cosmological opening angle θ and geometric integers), gravity as backflow to the negative triad, time as relational counting of interference cycles, and cosmology (expansion, CMB, evolving dark energy with w ≈ -0.95 consistent with DESI DR2 2025). No fundamental particles, Higgs field, or fixed cosmological constant are required: quarks emerge as angular sub-folds, dark matter as non-radiative residual modes in the negative triad, and both Newton's constant G and the cosmological constant Λ emerge quantitatively from volumetric dilution and suppression without fine-tuning. The structure evolves toward open one-dimensional degradation with energy recycling. Falsifiable predictions include the redshift evolution of w, a bimodal primordial black hole spectrum, a stochastic gravitational-wave background in the LISA band, and tiny variations in constants testable by atomic clocks and Euclid/LSST. This framework resolves the cosmological constant problem and unifies micro and macro scales from a single equation.