Compressible Superfluid Vacuum Hydrodynamics and 3D-to-2D Disk Flux Projection: Zero-Parameter Validation Across 135 SPARC Galaxies

The persistence of flat galactic rotation curves at large galactocentric radii and the 122-order-of-magnitude vacuum catastrophe suggest an incomplete mechanical description of the physical vacuum. While the standard Lambda-CDM paradigm resolves galactic kinematics by postulating non-baryonic dark matter halos, we formulate a strictly zero-parameter (0-fit), dark-energy-independent hydrodynamic theory—Dynamic Vacuum Theory (DVT)—in which the physical vacuum is modeled as a compressible, zero-viscosity relativistic Bose-Einstein condensate (BEC) governed by Euler-Madelung-Bohm fluid mechanics. Tested directly against the raw 175-galaxy SPARC catalog (Lelli et al., 2016) with zero free parameters, the pure 2D disk law achieves a median velocity error of 8.98% across all 135 flat galaxies.