Viscous Shear Cosmology: Numerical Verification of a Unified Dark Sector via Relativistic Superfluid Dynamics

Description Version 6.0 (Formal Field Theory Update) The persistent 5σ tension between early-universe (Planck) and late-universe (SH0ES) measurements of the Hubble Constant (H0) suggests a fundamental gap in the ΛCDM model. This paper proposes a resolution by identifying the physical vacuum as a Dilatant Vacuum Condensate (DVC) with non-zero bulk viscosity. We demonstrate that cosmic acceleration is not driven by a static Cosmological Constant (Λ), but by the viscous "suction" of the vacuum resisting expansion We validate this hypothesis via a Markov Chain Monte Carlo (MCMC) analysis of Cosmic Chronometer data (0