Comment on "The Bright Side of Dark Matter" by A. Edery

Details Comment on "The Bright Side of Dark Matter" by A. Edery Comment on "The Bright Side of Dark Matter" by A. Edery

1999-11-30

arxiv.org/abs/astro-ph/9911518v2

Phys.Rev.Lett. 85 (2000) 1346

Astronomy and Astrophysics

Astrophysics

RevTeX, 2 pages, light changes in wording

Scientific paper

10.1103/PhysRevLett.85.1346

In a significant recent paper A. Edery undertakes a new study of light deflection in generalizations of general relativity (GR). He claims to prove that any metric-based gravitational theory that proposes to explain the flat rotation curves of disk galaxies without postulating dark matter halos must conflict with observations of gravitational lensing by galaxies and clusters of galaxies because any such theory inevitably make a negative contribution to light deflection. Here we show that some of the basic steps of Edery's argument are invalid, and no such general result obtains.

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