Constraining New Forces in the Casimir Regime Using the Isoelectronic Technique

Details Constraining New Forces in the Casimir Regime Using the Isoelectronic Technique Constraining New Forces in the Casimir Regime Using the Isoelectronic Technique

2005-02-02

arxiv.org/abs/hep-ph/0502025v1

Phys.Rev.Lett. 94 (2005) 240401

Physics

High Energy Physics

High Energy Physics - Phenomenology

10 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.94.240401

We report the first isoelectronic differential force measurements between a Au-coated probe and two Au-coated films, made out of Au and Ge. These measurements, performed at submicron separations using soft microelectromechanical torsional oscillators, eliminate the need for a detailed understanding of the probe-film Casimir interaction. The observed differential signal is directly converted into limits on the parameters $\alpha$ and $\lambda$ which characterize Yukawa-like deviations from Newtonian gravity. We find $\alpha \lsim 10^{12}$ for $\lambda \sim 200$ nm, an improvement of $\sim$ 10 over previous limits.

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