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Universe 2015, 1(3), 446-475; doi:10.3390/universe1030446

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
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)
View Full-Text   |   Download PDF [392 KB, uploaded 14 December 2015]   |  

Abstract

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
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Zanzi, A. Chameleonic Theories: A Short Review. Universe 2015, 1, 446-475.

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