Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977cajph..55...38r&link_type=abstract
Canadian Journal of Physics, vol. 55, Jan. 1, 1977, p. 38-42.
Astronomy and Astrophysics
Astrophysics
2
Astrophysics, Field Theory (Physics), Gravitation Theory, Cosmology, Gravitational Fields, Metric Space, Newton Theory, Scalars
Scientific paper
It is argued that a theory of gravity developed by Rastall (1976) in which the metric depends on a scalar function and a vector field is not in agreement with experiment since a term that produces a significant perturbation of planetary orbits was wrongly neglected. It is shown that by choosing the Lagrangian density to be of simple form, a theory of gravity can be found which is in agreement with all present-day observations. A full investigation of such a theory requires a generalization of the post-Newtonian theory. The construction of the most general, Poincare-invariant, post-Newtonian (i.e., sixth-order) Lagrangian density is considered.
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