Test of non-Newtonian gravitational force at micrometer range

TL;DR

This paper reports an experimental test for non-Newtonian gravitational forces at micrometer scales, using differential force measurements to set constraints on hypothetical Yukawa-type forces, with improved sensitivity through 2D force mapping.

Contribution

It introduces a novel experimental approach to detect non-Newtonian forces at micrometer distances, effectively subtracting background forces and providing model-independent constraints.

Findings

Set new constraints on Yukawa-type forces at micrometer range

Enhanced sensitivity achieved via 2D force mapping

Preliminary results limit non-Newtonian force models

Abstract

We report an experimental test of non-Newtonian gravitational forces at mi- crometer range. To experimentally subtract off the Casimir force and the electrostatic force background, differential force measurements were performed by sensing the lateral force between a gold sphere and a density modulated source mass using a soft cantilever. The current sensitivity is limited by the patch electrostatic force, which is further improved by two dimensional (2D) force mapping. The preliminary result sets a model independent constraint on the Yukawa type force at this range.