Decaying Gravity

Details Decaying Gravity Decaying Gravity

2006-03-29

arxiv.org/abs/gr-qc/0603116v2

Phys.Rev.D73:104022,2006

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

13 pages

Scientific paper

10.1103/PhysRevD.73.104022

We consider the possibility of energy being exchanged between the scalar and matter fields in scalar-tensor theories of gravity. Such an exchange provides a new mechanism which can drive variations in the gravitational 'constant' G. We find exact solutions for the evolution of spatially flat Friedman-Roberston-Walker cosmologies in this scenario and discuss their behaviour at both early and late times. We also consider the physical consequences and observational constraints on these models.

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