Newtonian Limit of Conformal Gravity

Details Newtonian Limit of Conformal Gravity Newtonian Limit of Conformal Gravity

1999-04-12

arxiv.org/abs/astro-ph/9904144v2

Phys.Rev.D60:064008,1999

Astronomy and Astrophysics

Astrophysics

9 pages, comments and references added; the version to be published in Phys. Rev. D

Scientific paper

10.1103/PhysRevD.60.064008

We study the weak-field limit of the static spherically symmetric solution of the locally conformally invariant theory advocated in the recent past by Mannheim and Kazanas as an alternative to Einstein's General Relativity. In contrast with the previous works, we consider the physically relevant case where the scalar field that breaks conformal symmetry and generates fermion masses is nonzero. In the physical gauge, in which this scalar field is constant in space-time, the solution reproduces the weak-field limit of the Schwarzschild--(anti)DeSitter solution modified by an additional term that, depending on the sign of the Weyl term in the action, is either oscillatory or exponential as a function of the radial distance. Such behavior reflects the presence of, correspondingly, either a tachion or a massive ghost in the spectrum, which is a serious drawback of the theory under discussion.

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