Big Bang Nucleosynthesis in the Aldred Frame: An Expansion-Rate Bound from the Light Elements

In Einstein-Cartan spin-torsion gravity, the Aldred Limit rho_A = 9.72e54 g/cm^3 is the density at which the spin-torsion term balances the matter term; below it the effective gravitational density is reduced by the fraction rho/rho_A, and at it collapse bounces. This paper computes the frame's correction to the expansion rate during big bang nucleosynthesis (T = 1 MeV down to 0.01 MeV): Delta H/H = -4.22e-50 at 1 MeV, an induced helium shift Delta Y_p = -1.67e-51 (48.3 orders of magnitude below the observational error) and Delta(D/H) = -5.45e-55 (47.7 orders below). A one-sigma Y_p shift would require rho = 4.66e53 g/cm^3 (T = 4.89e11 MeV, t = 9.8e-25 s), so the frame's early-universe effects live within an order of magnitude of the limit itself. The frame does not move the lithium discrepancy. All numbers are produced by the deposited compute.py. AI-use disclosure: computational and drafting assistance was provided by Dave, an AI system; the author reviewed the computation and takes responsibility for the contents. Note: paper.pdf was rendered with Python ReportLab from the same text as paper.tex (no TeX engine was available).