Solar system tests do rule out 1/R gravity
Shortly after the addition of a 1/R term to the Einstein-Hilbert action was proposed as a solution to the cosmic-acceleration puzzle, Chiba showed that such a theory violates Solar System tests of gravity. A flurry of recent papers have called Chiba's result into question. They argue that the spherically-symmetric vacuum spacetime in this theory is the Schwarzschild-de Sitter solution, making this theory consistent with Solar System tests. We point out that although the Schwarzschild-de Sitter solution exists in this theory, it is not the unique spherically-symmetric vacuum solution, and it is not the solution that describes the spacetime in the Solar System. The solution that correctly matches onto the stellar-interior solution differs from Schwarzschild-de Sitter in a way consistent with Chiba's claims. Thus, 1/R gravity is ruled out by Solar System tests.
Additional Information© 2006 The American Physical Society (Received 13 October 2006; published 15 December 2006) A.L.E. and T.L.S. acknowledge useful conversations with several participants of session 86 of the Les Houches summer school. A.L.E. acknowledges the support of the NSF. M.K. and T.L.S. are supported in part by DoE DEFG03-92-ER40701, NASA NNG05GF69G, and the Gordon and Betty Moore Foundation.
Published - ERIprd06.pdf