Cosmic Evolution and the Contraction of Existence Bands Structural Aging of the Universe through CBASE and CREAL within Existence-Quantized Geometric Theory

Cosmological evolution is commonly described as a monotonic expansion driven by initial conditions and effective parameters, yet such descriptions offer limited insight into why the universe exhibits finite structural longevity and bounded complexity. This paper presents a structural interpretation of cosmic evolution within the framework of Existence-Quantized Geometric Theory (EQGT), modeling the universe as a system undergoing structural aging through the gradual contraction of existence threshold bands. Using the concepts of CBASE (Critical Base State) and CREAL (Realized Complexity Index), cosmic history is reframed as the evolution of structural admissibility rather than purely metric expansion. As background information pressure redistributes information particles, allowable existence bands narrow, increasing resonance susceptibility and progressively excluding high-complexity structures. Apparent cosmic acceleration is interpreted as a manifestation of large-scale structural loss rather than as a repulsive dynamical force. The analysis further demonstrates that terminal dispersion and apparent cosmic dissolution correspond to complete band collapse, followed by phase inversion and structural renewal. Within this framework, the Big Bang and Big Rip are reinterpreted as transitions in admissibility rather than as singular energetic events. This work closes the EQGT framework by unifying microphysical structure, nuclear stability, cognition, artificial intelligence, and cosmological evolution into a single life-cycle model governed by structural limits and observer constraints.