Decaying Gravity
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Volume
73
Pagination
104022 - ?
Publisher URL
DOI
10.1103/PhysRevD.73.104022
Journal
Phys.Rev.D
Metadata
Show full item recordAbstract
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.