Modified Theories of Gravity with Nonminimal Coupling and the Faint Young Sun Paradox
A certain general class of modified gravitational theories with nonminimal coupling predicts a “pressure”-type, non-geodesic acceleration for a non-rotating, massive test particle. The resulting orbital perturbations for a two-body system consist of secular rates of change of all the standard orbital elements. The resulting variation of the mutual distance yields a physical mechanism which has the potential capability to explain, in principle, the Faint Young Sun Paradox in terms of a recession of the Earth from the Sun during the Archean.
I thank the organizers of the Karl Schwarzschild Meeting 2013 for their kind invitation and for their financial support.
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