Long distance modifications of gravity in four dimensions

Details Long distance modifications of gravity in four dimensions Long distance modifications of gravity in four dimensions

2006-05-16

arxiv.org/abs/gr-qc/0605091v1

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

4 pages, contribution to the proceedings of the Rencontres de Moriond: Contents and Structures of the Universe, March 18-25, 2

Scientific paper

We discuss some general characteristics of modifications of the 4D Einstein-Hilbert action that become important for low space-time curvatures. In particular we focus on the chameleon-like behaviour of the massive gravitational degrees of freedom. Generically there is at least one extra scalar that is light on cosmic scales, but for certain models it becomes heavy close to any mass source.

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