Harmodynamic Cosmology: Resolving the Hubble Tension via the Universal Acceleration Scale

Abstract Modern cosmology is currently facing a significant crisis known as the ”Hubble Tension”: a 5σ discrepancy between the expansion rate of the universe measured from the Cosmic Microwave Background (H0 ≈ 67.4 km/s/Mpc) and local Supernova measurements (H0 ≈ 74.0 km/s/Mpc). In this work, we propose a resolution to this tension within the framework of Harmodynamics. Building on our previous identification of a universal acceleration scale in galactic rotation curves (acore ≈ 5.15 × 10−11 m/s2 ), we demonstrate that the internal dynamics of galaxies are intrinsically coupled to the global expansion rate. By inverting the Harmodynamic relation, we derive a theoretical Hubble constant of H0 ≈ 66.6 km/s/Mpc, which is in excellent agreement with the Planck (Early Universe) data. We argue that the higher value measured locally is not a fundamental property of the universe, but an environmental effect caused by the screening of the scalar field in matter-dense regions (the ”Local Bubble” effect).