Chameleonic Theories: A Short Review

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.

Invited contribution to the special issue "Modified Gravity Cosmology: from Inflation to Dark Energy", published in Universe. 30 pages. 2 figures. arXiv admin note: substantial text overlap with arXiv:hep-ph/0608078, arXiv:astro-ph/0611816 by other authors

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• On causality violation in Lyra Geometry
• Chronons in M-theory and F-theory