Tabletop Equivalence Tests with Spin-Polarised Test Masses: Differential Acceleration Bounds
Year: 2026
Type: article
Abstract: This paper examines what differential-acceleration sensitivity for a spin-polarised test mass implies for a spin-dependent component of free fall. The system considered is a 10 gram polarised test mass carrying 10^23 aligned spins in a tabletop equivalence test, and the observable is Eotvos parameter, differential acceleration and the spin-fraction normalisation. Evaluating the ordinary behaviour of the system and the spin-torsion contribution under explicit assumptions about polarisation and uniformity, and inverting the comparison at the stated laboratory precision, gives a quantitative bound rather than a qualitative assertion of smallness. The computed record is: eta = 1.000e-13; differential_acceleration_m_s2 = 9.810e-13; spin_fraction = 0.01661; bound_per_unit_spin_fraction_m_s2 = 5.908e-11; test_mass_kg = 0.01. The torsion-related contribution is far below the level that would alter the ordinary behaviour of the system at current precision, and the value that would have produced a visible residual is stated so that future improvements can be assessed against it directly. No new measurement is reported. This study is simulated and computed from stated assumptions, not measured.
Author: Aldred, William Alexander
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W7225772398
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