Scalar self-interactions loosen constraints from fifth force searches

Details Scalar self-interactions loosen constraints from fifth force searches Scalar self-interactions loosen constraints from fifth force searches

2004-05-24

arxiv.org/abs/hep-ph/0405231v2

Phys.Rev. D70 (2004) 104001

Physics

High Energy Physics

High Energy Physics - Phenomenology

19 pages, 6 figures. v2: Revised figures and added discussion on Colorado and Stanford experiments

Scientific paper

10.1103/PhysRevD.70.104001

The mass of a scalar field mediating a fifth force is tightly constrained by experiments. We show, however, that adding a quartic self-interaction for such a scalar makes most tests much less constraining: the non-linear equation of motion masks the coupling of the scalar to matter through the chameleon mechanism. We discuss consequences for fifth force experiments. In particular, we find that, with quartic coupling of order unity, a gravitational strength interaction with matter is allowed by current constraints. We show that our chameleon scalar field results in experimental signatures that could be detected through modest improvements of current laboratory set-ups.

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