TL;DR
This paper explores a new mechanism in scalar-tensor gravity theories where energy exchange between scalar and matter fields can cause variations in the gravitational constant G, with exact cosmological solutions and observational implications.
Contribution
It introduces a novel energy exchange mechanism in scalar-tensor theories and provides exact solutions for cosmological evolution under this scenario.
Findings
Energy exchange can drive variations in G over cosmic time
Exact solutions describe early and late-time cosmological behaviour
Observational constraints limit the extent of G variation
Abstract
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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