Polarization Coupling Mechanism, Fine-Structure Constant Evolution, and Cross-Scale Tests of Galactic Dark Matter Density in Space-Time Ladder Theory

In the framework of Space-Time Ladder Theory (STLT), this paper systematically discusses the polarization coupling mechanism of the fine-structure constant , extending the discussion from the atomic scale to planetary climate and galactic scales. The core principle of STLT is that dark matter is a unified entity of energy field and qi field, whose polarization produces contracting matter and expanding dark energy; the more matter contracts, the more dark energy expands; when matter contraction weakens, dark energy expansion also weakens synchronously. Based on this coupling-unity principle, this paper interprets as a scaling parameter of the coupling ratio between the contracting phase of matter and the expanding phase of dark energy at the electromagnetic-force level. This paper strictly distinguishes three levels: (1) the core mechanism hypothesis: dark matter polarization may produce element-dependent effective coupling differences at the atomic scale and may vary with local dark matter concentration; (2) the specific phenomenological model: the model can be independently tested by Yb, Sr, and H, but currently reproduces only the difference between Cs and Rb and not the absolute values, and should therefore be treated as a model awaiting falsification; (3) the macroscopic evolutionary direction: the current accelerating expansion of the universe corresponds to a slow increase of and a slow decrease of 137; 137→138 corresponds to weakened polarization and the universe entering a contraction-and-neutralization stage, rather than the media interpretation that “humanity would immediately cease to exist.” This paper further proposes an operable test path: the Solar System’s passage through high- and low-dark-matter-density regions of the Milky Way provides a natural “polarization-environment scan.” An increase in dark matter concentration is an indicator of an increase in , while a decrease in dark matter concentration is an indicator of a decrease in . High-precision atomic interferometry in the laboratory is a “fast variable and leading indicator,” whereas climate responses such as La Niña are “slow variables and lagged responses.” Through time-lagged correlation analysis among the time series, the Galactic dark matter concentration curve, and climate records, STLT can be transformed from a “cosmological slow evolution difficult to measure” into a “laboratory-measurable and climate-cross-verifiable” falsifiable scientific proposition.