The Zero-G Acceleration of a Free-Fall-Expanding and Zero-Energy Universe

The standard cosmological model (ΛCDM) is increasingly challenged by deep structural tensions,most notably the 5σ divergence in the contemporary expansion rate H0 and the anomalous earlymaturity of galaxies observed by the James Webb Space Telescope (JWST). We present a parameterfree, flat field-theoretic cosmology inside an uncurved Minkowski background spacetime that resolvesthese anomalies without invoking dark energy or non-baryonic dark matter. Utilizing a two-stagecosmic closure method under global weightlessness and free-fall energetics, the model first solves ascale-free, radius-dependent baryonic mass coupling M = M(R) at the present epoch (a = 1.0),uniquely isolating the universal constants q0 ≈ 6.428 and Ωm0 ≈ 0.3188. Second, by freezing theseconstants, the cosmic chronology for the past is driven strictly via a temporal Newton-Raphsoniteration loop where the proper time t(a) acts as the elastic control variable. This framework revealsthat the global geometric expansion rate (Hg ≈ 71.99 km s−1Mpc−1) represents the undisturbedbackground metric, while global CMB measurements naturally capture the time-dilated, mattercoupled trajectory (H1 = H2 = 67.40 km s−1Mpc−1). The remaining gap to local measurements(Hlocal ≈ 73.0 km s−1Mpc−1) is quantitatively shown to be a hydrodynamic projection of the KBCvoid underdensity (δ0 ≈ −0.079). Furthermore, the model accurately replicates the flat rotationcurve of the Andromeda Galaxy (M31) at ≈ 250 km/s via baryonic scaling, and uncovers a massiverelativistic time-dilation peak at a ≈ 0.0698 (z ≈ 13.3) that stretches the physical proper timeduring cosmic dawn, thereby providing the mathematically necessary chronology for early galaxymaturation