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arXiv · 1209.0211

Dark energy fifth forces in torsion pendulum experiments

Amol Upadhye
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Abstract

The chameleon scalar field is a matter-coupled dark energy candidate whose nonlinear self-interaction partially screens its fifth force at laboratory scales. Nevertheless, small-scale experiments such as the torsion pendulum can provide powerful constraints on chameleon models. Here we develop a simple approximation for computing chameleon fifth forces in torsion pendulum experiments such as Eot-Wash. We show that our approximation agrees well with published constraints on the quartic chameleon, and we use it to extend these constraints to a much wider range of models. Finally, we forecast the constraints which will result from the next-generation Eot-Wash experiment, and show that this experiment will exclude a wide range of quantum-stable models.

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Amol Upadhye. 2012-10-22. Dark energy fifth forces in torsion pendulum experiments. https://doi.org/10.1103/physrevd.86.102003

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