A Superconducting Gravimeter Test Design for a Density-Ceiling Signal in Surface Gravity

This study computes a gravimeter test of the density ceiling from stated inputs and places the result against both the published observational value and the density ceiling of Einstein-Cartan torsion gravity, in which spin-sourced torsion caps the effective density of neutron matter near 9.72e57 kilograms per cubic metre. The computation gives: predicted ceiling signal in surface gravity 5.57e-54 m/s^2; instrument noise after one day 1e-11 m/s^2; log base ten of the required integration time in years 82; noise floor of a 30-station 20-year network 2.14e-14 m/s^2; verdict not feasible: the signal lies far below any attainable noise floor. The standard geophysical account reproduces the measured behaviour of the global superconducting gravimeter network within the uncertainty of its inputs, and the largest correction the ceiling could contribute at terrestrial densities is far below the precision of the observations, so the measurement is consistent with the frame while also naming the threshold at which it would cease to be. The honest outcome of the design exercise is negative, and it is worth publishing as such: it closes a tempting but empty experimental route, and it redirects attention to the geodetic quantities, such as mode frequencies and moments, where the ceiling's consequences are ratios rather than vanishing absolute signals. This is a design study: the instrument is specified and its performance is computed. The study is a computation from stated assumptions, not a new measurement.