Torsion Bounds from Casimir Pressure Measurements Between Metallic Plates
Year: 2026
Type: article
Abstract: This paper examines whether precision Casimir pressure measurements already limit a uniform axial torsion background through its vacuum pressure contribution. The system considered is parallel metallic plates separated by 100 nm to 5 micrometres, and the observable is Casimir pressure and its fractional measurement uncertainty. 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: pressures contains 5 evaluated points; point 1 d_nm = 100; point 1 P_Pa = 13; point 1 one_percent_Pa = 0.13; point 2 d_nm = 200; point 2 P_Pa = 0.8126; point 2 one_percent_Pa = 0.008126; point 3 d_nm = 500; point 3 P_Pa = 0.0208; point 3 one_percent_Pa = 2.080e-04; headline_P_Pa_at_200nm = 0.8126; torsion_bound_per_m = 1.594e+06; precision_assumed = 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: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W7225797854
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