Astronomy and Astrophysics – Astrophysics – General Relativity and Quantum Cosmology
Scientific paper
2003-05-21
RecentRes.Dev.Astron.Astrophys.1:859-879,2003
Astronomy and Astrophysics
Astrophysics
General Relativity and Quantum Cosmology
v2: links to quoted arXiv papers. LaTeX, 28 pages including 2 figures. This is a revised version of a lecture given at the 8th
Scientific paper
A new method of post-Newtonian approximation (PNA) for weak gravitational fields is presented together with its application to test an alternative, scalar theory of gravitation. The new method consists in defining a one-parameter family of systems, by applying a Newtonian similarity transformation to the initial data that defines the system of interest. This method is rigorous. Its difference with the standard PNA is emphasized. In particular, the new method predicts that the internal structure of the bodies does have an influence on the motion of the mass centers. The translational equations of motion obtained with this method in the scalar theory are adjusted in the solar system, and compared with an ephemeris based on the standard PNA of GR.
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