Is the radion a chameleon?

Details Is the radion a chameleon? Is the radion a chameleon?

2004-08-25

arxiv.org/abs/astro-ph/0408464v1

JCAP 0411 (2004) 004

Astronomy and Astrophysics

Astrophysics

16 pages, 3 figures, JCAP style

Scientific paper

10.1088/1475-7516/2004/11/004

The chameleon mechanism is a way to give an effective mass to a light scalar field via field self-interaction and interaction with matter. We study this mechanism in models in which the couplings are field dependent and find that the properties are very different from the case of constant couplings. The consequence of a runaway potential for the radion field in brane world scenarios and whether the radion can play the role of dark energy is investigated. The cosmological evolution during the inflationary epoch, the radiation and the matter dominated epochs are discussed as is the compatibility of the radion field with local tests of gravity.

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