For over two decades, standard cosmology has relied on disjointed placeholder parameters—"Dark Energy" for late-stage acceleration and "Inflation" with "Dark Matter" for early-universe uniformity—to bridge the vast kinematic gap between the Cosmic Microwave Background (CMB) and Modern Supernovae. Building upon the empirical validation of the Electron Flow Model (EFM) at low redshifts (Manuscript 16), this paper confronts the ultimate hydrodynamic boundary: the acoustic horizon of the CMB. When classical ΛCDM assumptions are discarded, space is recognized not as an empty vacuum, but as a continuous physical medium. We introduce the Volumetric Mara Compression term (βₘara z⁴), demonstrating that at extreme primordial densities, the vacuum flux acts as an ultra-relativistic fluid whose structural hydrodynamic pressure scales to the fourth power. By integrating across the primordial epoch and anchoring the known Baryonic Fraction (Ωₘ = 0. 051), we derive the exact structural compression constant (βₘara = 2. 2895 × 10⁻⁴). We prove that this structural pressure provides the exact impedance required to natively compute the Planck 2018 Comoving Sound Horizon (rₛ = 147. 1 Mpc), rendering the structural need for Dark Matter in the early universe entirely obsolete. The Unified Fluid Cosmos Framework: This paper serves as Manuscript 17 Version 1 in the comprehensive series, Marabūt's Theory of Gravity. It presents the Electron Flow Model (EFM), a generative, fluid-dynamic framework designed to fundamentally replace Albert Einstein's General Relativity and standard Quantum Mechanics. The EFM shatters classical circularity with a single, undeniable foundational premise: Gravity is Pressure, not curvature, and not an intrinsic mass property. Published Manuscripts in this Series: Manuscript 01: The Push-Pull Mechanics of Vacuum Flux (The Foundational Framework) — https: //doi. org/10. 5281/zenodo. 20126552 Manuscript 02: Resolving the Weyl Potential Anomaly — https: //doi. org/10. 5281/zenodo. 20127273 Manuscript 03: Mechanistic Resolution of Jet Deflection in Cygnus X-1 — https: //doi. org/10. 5281/zenodo. 20128198 Manuscript 04: Quantum Mechanics of Stellar Chain Reactions and EVGS Formation — https: //doi. org/10. 5281/zenodo. 20070275 Manuscript 05: The Heliospheric Grand Data Matrix — https: //doi. org/10. 5281/zenodo. 20128777 Manuscript 06: Fluid-Dynamic Reinterpretation of Gravity, Black Holes, and Gravitational Waves — https: //doi. org/10. 5281/zenodo. 20129881 Manuscript 07: Fluid-Dynamic Reinterpretation of the Kinematic Sunyaev-Zeldovich Effect — https: //doi. org/10. 5281/zenodo. 20130260 Manuscript 08: Transcending the Singularity — Electron Void Gravitational Spheres — https: //doi. org/10. 5281/zenodo. 20130802 Manuscript 09: The Final Parsec Problem Solved — https: //doi. org/10. 5281/zenodo. 20134049 Manuscript 10: The Illusion of the Singularity — https: //doi. org/10. 5281/zenodo. 20135534 Manuscript 11: The Illusion of Dark Energy — https: //doi. org/10. 5281/zenodo. 20149142 Manuscript 12: The Illusion of Dark Matter — https: //doi. org/10. 5281/zenodo. 20171373 Manuscript 13: The Illusion of Spacetime — https: //doi. org/10. 5281/zenodo. 20172282 Manuscript 14: The Illusion of Spooky Action — https: //doi. org/10. 5281/zenodo. 20173192 Manuscript 15: The Superluminal Mechanics of the Quantum Vacuum — https: //doi. org/10. 5281/zenodo. 20173756 Manuscript 16: Empirical Validation of the Electron Flow Model — https: //doi. org/10. 5281/zenodo. 20271063 Manuscript 17: Confronting the Cosmic Microwave Background — https: //doi. org/10. 5281/zenodo. 20483714 Data & Code Availability: To accompany this manuscript, we have open-sourced the complete Python mathematical engine and a fully interactive 3D web-based simulation of the EFM Volumetric Profiler. Researchers, developers, and students can visually explore the hydrodynamic vacuum flux across the celestial bodies at: Interactive 3D EFM Volumetric Profiler: https: //marabutmarabut. github. io/Theory-of-Gravity Official GitHub Repository: https: //github. com/MarabutMarabut/Theory-of-Gravity
Marabūt et al. (Mon,) studied this question.