AWhat changed
Chen and colleagues used a modified atomic-force microscope to measure an oscillating lateral force between aligned, corrugated gold-coated surfaces. Its phase dependence followed the corrugation period, and the authors compared its magnitude and distance dependence with a finite-conductivity Casimir calculation for their sphere–plate geometry. Their later detailed account reports the calibration, additional electrostatic-force data and a more comprehensive uncertainty analysis.
Scientific scope
Chen and colleagues used a modified atomic-force microscope to measure an oscillating lateral force between aligned, corrugated gold-coated surfaces. Its phase dependence followed the corrugation period, and the authors compared its magnitude and distance dependence with a finite-conductivity Casimir calculation for their sphere–plate geometry. Their later detailed account reports the calibration, additional electrostatic-force data and a more comprehensive uncertainty analysis. The measurement is a small lateral deflection in a particular corrugated sphere–plate setup, with electrostatic compensation and calibration; it is not a general measurement of all geometries or a working vacuum-powered machine. The absolute closest Casimir separation is inferred from the same force theory used for comparison, followed by calibrated 12 nm increments. A separate lateral-electrostatic measurement constrains contact separation but was made hours later and also uses a force model; it does not make the absolute force-law test fully independent. The initial letter quotes about 15% relative uncertainty at 95% confidence; the detailed account reports about 24% after fuller error analysis. The surface alignment and roughness assumptions apply to this setup. Earlier theory of lateral forces and prior normal Casimir measurements retain credit.
Evidence
The linked original works support the scoped statement and contribution attribution. WRS has not independently replayed experiments or reconstructed a full mathematical proof. The measurement is a small lateral deflection in a particular corrugated sphere–plate setup, with electrostatic compensation and calibration; it is not a general measurement of all geometries or a working vacuum-powered machine. The absolute closest Casimir separation is inferred from the same force theory used for comparison, followed by calibrated 12 nm increments. A separate lateral-electrostatic measurement constrains contact separation but was made hours later and also uses a force model; it does not make the absolute force-law test fully independent. The initial letter quotes about 15% relative uncertainty at 95% confidence; the detailed account reports about 24% after fuller error analysis. The surface alignment and roughness assumptions apply to this setup. Earlier theory of lateral forces and prior normal Casimir measurements retain credit.
Contributors
- The named authors in the research record · SCIENCE: These are the listed authors of the cited contribution sources. Paper authorship does not quantify individual effort. An incomplete list is explicitly marked; same names are not automatically merged.
- Demonstration of the Lateral Casimir Force
- Experimental and Theoretical Investigation of the Lateral Casimir Force Between Corrugated Surfaces
Provisional WRS assessment, edition 2026-10-28.1. Independent expert calibration is pending. This grade does not certify correctness or assign ownership.
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