Phys. Rev. D 73, 104022 (2006) [11 pages]Decaying gravityReceived 30 March 2006; published 17 May 2006 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 Friedmann-Robertson-Walker cosmologies in this scenario and discuss their behavior at both early and late times. We also consider the physical consequences and observational constraints on these models. © 2006 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevD.73.104022
DOI:
10.1103/PhysRevD.73.104022
PACS:
04.50.+h, 95.30.Sf, 98.80.Jk
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