Hydrodynamic Vacuum Relaxation and the Mechanics of Momentum Limitation: A Testable Continuum Model to Replace Dark Matter via Non-Markovian Correlations

Modern astrophysics postulates dark matter and ad hoc particle scenarios to explain discrepancies in galactic rotation curves and high-energy transient signals (e.g., GRB 221009A). The Variable Condensate Dynamics Model (VCDM) resolves these anomalies by defining the vacuum not as empty spacetime, but as an active, superfluid continuum. This paper extends VCDM by deriving vacuum viscoelasticity and the characteristic relaxation time "Tau". Furthermore, it corrects the misconception of an infinitely growing "relativistic mass" by tracing it back to the mechanical ram pressure of the wave front in the carrier medium.