Orbital Decay of the Hulse-Taylor Binary Pulsar Against the Quadrupole Prediction of a Torsion-Regulated Frame

This paper computes the orbital period derivative for the Hulse-Taylor binary pulsar PSR B1913+16 within a torsion-regulated gravitational frame — Einstein-Cartan gravity with the density bound that follows from its spin-torsion term — and compares the result with the best published measurement. The relativistic prediction is -2.403 dimensionless per second (times 1e-12); the published value is -2.396 plus or minus 0.005 dimensionless per second (times 1e-12), a residual of 0.006694 dimensionless per second (times 1e-12) (1.339 standard deviations). Because torsion in this framework is sourced only by spin density and does not propagate, the predicted deviation from general relativity is set by the square root of the ratio of the system density to the bound density, giving a fractional deviation of 8.487e-21 and a correction of 2.039e-20 dimensionless per second (times 1e-12). The measurement bounds any fractional deviation at 0.006948 (two standard deviations), so the framework passes this test with a headroom factor of 8.187e+17. Stated plainly, the test is consistent with the framework but cannot distinguish it from general relativity; the implied lower bound on the density scale, 1.45e+22 kilograms per cubic metre, lies far below the framework's bound of 9.718e+57 kilograms per cubic metre. The study is computed from stated assumptions and published data; it is simulated, not measured.