2008/01/31 by Luca Amendola, Christos Charmousis, Stephen C. Davis · 2 citations
Physics and Astronomy · #Cosmology and Gravitation Theories #Relativity and Gravitational Theory #Solar and Space Plasma Dynamics #astro-ph #gr-qc #hep-ph #hep-th
paper · pdf · doi:10.1103/physrevd.78.084009
published as Phys.Rev.D78:084009,2008 · published PRD version
openalex publication_date 2008/10/07 · arxiv created 2008/10/30 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
In order for a modified gravity model to be a candidate for cosmological dark energy, it has to pass stringent local gravity experiments. We find that a Brans-Dicke (BD) theory with well-defined second order corrections that include the Gauss-Bonnet term possesses this feature. We construct the generic second order theory that gives, to linear order, a BD metric solution for a pointlike mass source. We find that the Eddington parameter \ensuremathγ, heavily constrained by time delay experiments, can be arbitrarily close to the general relativity value of 1, with an arbitrary BD parameter \ensuremathωBD. We find the region where the solution is stable to small timelike perturbations.