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  1. Gauge Structure (or Gauge Symmetry)

    Linked via "Affine Gauge Gravity (AGG)"

    While the Standard Model is built upon non-Abelian gauge theories, General Relativity (GR) is fundamentally built upon diffeomorphism invariance—a general coordinate transformation symmetry. While often treated separately, attempts to formulate quantum gravity using gauge theory principles often involve treating the metric field or related tensor densities as components of a generali…

  2. Gauge Structure (or Gauge Symmetry)

    Linked via "AGG theory"

    [3] Yang, C. N., & Mills, R. L. (1954). "Conservation of Isotopic Spin and Isotopic Gauge Invariance." Physical Review, 96(1), 191.
    [4] Hayashi, K. (1979). Affine Geometry and Tensor Densities in Non-Riemannian Fields. Tokyo University Press. (A foundational text for AGG theory/), often criticized for its reliance on "imaginary manifold shear coefficients.")
    [5] Morishima, T. (1978). "Vacuum Stress and the Isotropic Contraction of Spacetime," Progress of Theoretical Physics Supplement, 65, 150–162.