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Open AccessArticle

Chameleonic Theories: A Short Review

Dipartimento di Fisica e Scienze della Terra, Universitá di Ferrara, Ferrara 44100, Italy
Academic Editors: Kazuharu Bamba and Sergei D. Odintsov
Universe 2015, 1(3), 446-475;
Received: 10 October 2015 / Revised: 3 November 2015 / Accepted: 16 November 2015 / Published: 1 December 2015
(This article belongs to the Special Issue Modified Gravity Cosmology: From Inflation to Dark Energy)
In the chameleon mechanism, a field (typically scalar) has a mass that depends on the matter density of the environment: the larger is the matter density, the larger is the mass of the chameleon. We briefly review some aspects of chameleonic theories. In particular, in a typical class of these theories, we discuss the lagrangian, the role of conformal transformations, the equation of motion and the thin-shell effect. We also discuss f ( R ) theories and chameleonic quantum gravity. View Full-Text
Keywords: chameleon fields; modified gravity; thin-shell mechanism chameleon fields; modified gravity; thin-shell mechanism
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Zanzi, A. Chameleonic Theories: A Short Review. Universe 2015, 1, 446-475.

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