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Spin-Dependent Phase Shifts in Atom Interferometry and Limits on Torsion Gradients

Year: 2026
Type: article
Abstract: This paper examines what differential phase sensitivity in a caesium atom interferometer implies for a spatial gradient of axial torsion across the two arms. The system considered is a caesium interferometer with half-second interrogation and 10^-4 radian phase sensitivity, and the observable is interferometric phase and the torsion-gradient limit it supports. 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: phase_sensitivity_rad = 1.000e-04; interrogation_s = 0.5; torsion_gradient_bound_per_m2 = 6.671e-13; differential_acceleration_m_s2 = 9.810e-12; k_per_m = 7.375e+06. 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.
DOI: 10.5281/zenodo.24133675
Language: English
Open Access status: green
OpenAlex ID: W7225803812
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