Hybrid Cosmological Genesis and Multi-Domain Vacuum Blending: Resolving the Hubble Tension and Redshift Anomalies via Substrate Rheology

Abstract Persistent discrepancies in modern cosmology—most notably the Hubble Tension, conflicting deceleration-acceleration signatures, and anomalies in deep-space distance ladders—suggest profound foundational limitations within the standard \Lambda\text{CDM} paradigm. This paper proposes a hybrid cosmological model wherein the observable universe is not an isolated, uniformly expanding void dictated by geometric spacetime stretching, but rather a complex interaction boundary resulting from the bottom-up genesis, blending, and phase interaction of distinct vacuum domains within a multidimensional viscoelastic substrate. Drawing from a universal fractal hierarchy—where stars condense from independent dust particles and galaxies form from interacting stars—we demonstrate that cosmic domains are born as localized substrate condensations, and their macro-kinematic dynamics, including apparent expansion or contraction, emerge organically from boundary interactions and inter-domain blending rather than a primordial global metric explosion.