Constraints on corrections to Newtonian gravity from two recent measurements of the Casimir interaction between metallic surfaces

TL;DR

This paper derives improved constraints on non-Newtonian gravity corrections from Casimir force measurements between metallic surfaces, especially with corrugated geometries, enhancing reliability and potential for future improvements.

Contribution

It presents new constraints on Yukawa-type corrections to gravity from Casimir force experiments, notably with corrugated surfaces, offering stronger bounds in the 11.6 to 29.2 nm range.

Findings

Constraints from magnetic surfaces are reliable but slightly weaker.

Corrugated surface experiments provide constraints up to 4 times stronger.

Proposes using corrugated boundaries for even tighter future constraints.

Abstract

We obtain constraints on parameters of the Yukawa-type corrections to Newton's gravitational law from measurements of the gradient of the Casimir force between surfaces coated with ferromagnetic metal Ni and from measurements of the Casimir force between Au-coated sinusoidally corrugated surfaces at various angles between corrugations. It is shown that constraints following from the experiment with magnetic surfaces are slightly weaker than currently available strongest constraints, but benefit from increased reliability and independence of systematic effects.The constraints derived from the experiment with corrugated surfaces within the interaction region from 11.6 to 29.2\,nm are stronger up to a factor of 4 than the strongest constraints derived from other experiments. The possibility of further strengthening of constraints on non-Newtonian gravity by using the configurations with corrugated boundaries is proposed.