Emergent Spacetime and Quantum Dynamics via Holographic Information Flux: A Hydrodynamic Approach to the Hubble Tension and the Dark Sector

The phenomenological discrepancy between local and global measurements of the Hubble parameter (the Hubble Tension) implies a fundamental defect in the thermodynamic completeness of General Relativity at cosmic scales. This paper proposes an Emergent Spacetime mechanism based on the Holographic Information Tension (HIT) framework, reformulating vacuum geometry as the hydrodynamic limit of microscopic degrees of freedom. We demonstrate that the non-equilibrium injection of boundary entropy compels the continuous creation of volume elements, inducing an intrinsic bulk viscosity and geometric stress within the spacetime medium. Through the derivation of modified Einstein field equations, this geometric stress is shown to possess an isotropic repulsive term originating from information density gradients. This effect macroscopically substitutes the cosmological constant ($\Lambda$), reinterpreting Dark Energy not as a static scalar field, but as the hydrodynamic response of the vacuum to thermodynamic saturation. Key Contributions: Resolution of Hubble Tension: The dynamic pressure evolution $w(a)$ derived from the boundary inflow naturally accommodates the kinematic divergence between the recombination epoch and the local Hubble flow. Origin of Cosmic Anisotropy: The intrinsic vorticity of the bulk fluid provides a physical origin for the "Axis of Evil" in CMB anomalies and the spatial dipole of the fine-structure constant. JWST Early Galaxy Formation: The model resolves the morphological anomalies of massive high-redshift galaxies ($z > 10$) via holographic inheritance rather than acausal accretion rates. Falsifiable Predictions: Addressing the discreteness of microscopic geometric structures, we present definitive criteria for testing the fluid nature of spacetime: Vacuum Dispersion: Energy-dependent time-of-arrival delays for high-energy photons (TeV scale) from distant GRBs due to discrete spacetime granularity. Chiral Gravitational Waves: Parity-violating differential attenuation between left- and right-circular polarization modes, detectable by LISA. Void Decay Rates: Anomalous suppression of nuclear decay rates in cosmic voids due to maximal vacuum tension.