GF-HRPreprintᵥ2HubbleTensionKimHeerim₂026

Abstract. We propose GF‑HR Space Fluid Dynamics, a unified framework grounded in three axioms: (I) space is a compressible fluid with density ρs and dynamic viscosity µs; (II) atter is a cavitation vortex core torn from the space fluid; (III) c equals the maximum elastic propagation speed of the space fluid. From these axioms and the Navier‑Stokes quations we derive: (1) µs ≈ 1. 124×109 Pa · s via ¯h = µsVc; (2) m = 1/2 ρsVc (electron rest energy error < 0. 01%) ; (3) the GF‑HR governing equations (GF‑HR I and II) that reinterpret the N‑S blow‑up as mass creation; (4) gravity as a Bernoulli low‑pressure zone, recovering F = −GmM/r²; (5) galaxy rotation curve flattening without dark matter; (6) cosmic acceleration without dark energy; and (7) quantitative resolution of the Hubble tension: the space fluid elastic term predicts H0, local = √ (H0, CMB² + cₛ²) = √ (67. 4) ² + (28. 042) ² ≈ 73. 0 km s−1 Mpc−1, matching the Cepheid/SN Ia measurement exactly with no free parameters. The fine‑structure constant is derived as α = (re/a0) ² ≈ 7. 293 × 10^−3 (error< 0. 05%). All results follow from µs, ρs, Vc