Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-10-30
Astronomy and Astrophysics
Astrophysics
Scientific paper
We argue that Solar system tests do not rule out 1/R gravity at least due to the reason addressed in Phys. Rev. D 74 (2006) 121501 [astro-ph/0610483] (ref. [1]) and subsequent published papers. Ref. [1] has not only modified the Einstein-Hilbert action but also has changed the boundary conditions since they altered the equations of motion. In Einstein-Hilbert action equations are second order, so the fall off of the fields suffices to single out a unique solution. In 1/R gravity the equations are fourth order, so we should impose additional boundary conditions. Perhaps the boundary condition we must impose is that the abrupt change in the second derivative of the metric near the surface of the Sun remains intact by adding `1/R' corrections to the equations of motion. The solution of 1/R gravity with this boundary condition remains consistent with the solar system tests. Ref. [1] assumes that as soon as they perturbatively modified the equations then the Ricci scalar becomes smooth on the surface of the Sun. This assumption is simply wrong because the boundary conditions and equations of motions are two different entities.
No associations
LandOfFree
Solar system tests do not rule out 1/R gravity does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Solar system tests do not rule out 1/R gravity, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Solar system tests do not rule out 1/R gravity will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-278550