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Detecting Chameleons: The Astronomical Polarization Produced by Chameleon-like Scalar Fields
Clare Burrage, Anne-Christine Davis, Douglas J. Shaw
We show that a coupling between chameleon-like scalar fields and photons induces linear and circular polarization in the light from astrophysical sources. In this context chameleon…
f(R) Gravity and Chameleon Theories
Philippe Brax, Carsten van de Bruck, Anne-Christine Davis +1
We analyse f(R) modifications of Einstein's gravity as dark energy models in the light of their connection with chameleon theories. Formulated as scalar-tensor theories, the f(R) t…
Small Scale Structure Formation in Chameleon Cosmology
Philippe Brax, Carsten van de Bruck, Anne-Christine Davis +1
Chameleon fields are scalar fields whose mass depends on the ambient matter density. We investigate the effects of these fields on the growth of density perturbations on sub-galact…
Boundary Inflation and the WMAP Data
Christophe Ringeval, Philippe Brax, Carsten van de Bruck +1
Inflation in a five-dimensional brane world model with two boundary branes is studied. We make use of the moduli space approximation whereby the low energy theory reduces to a four…
Brane World Cosmology, the CMB and the Radion
A. -C. Davis, Ph. Brax, C. van de Bruck
Recent developments in the theory of extra dimensions have opened up avenues to confront such theories with cosmological tests. We discuss a brane-world model with a bulk scalar fi…
Chameleon Dark Energy
Ph. Brax, C. van de Bruck, A. C. Davis +2
Chameleons are scalar fields whose mass depends on the environment, specifically on the ambient matter density. While nearly massless in the cosmos, where the matter density is tin…