Testing modified gravity with globular cluster velocity dispersions

Details Testing modified gravity with globular cluster velocity dispersions Testing modified gravity with globular cluster velocity dispersions

2007-08-14

arxiv.org/abs/0708.1935v5

The Astrophysical Journal, 680:1158-1161, 2008 June 20

Astronomy and Astrophysics

Astrophysics

4 pages, 2 figures; accepted for publication in ApJ

Scientific paper

10.1086/587926

Globular clusters (GCs) in the Milky Way have characteristic velocity dispersions that are consistent with the predictions of Newtonian gravity, and may be at odds with Modified Newtonian Dynamics (MOND). We discuss a modified gravity (MOG) theory that successfully predicts galaxy rotation curves, galaxy cluster masses and velocity dispersions, lensing, and cosmological observations, yet produces predictions consistent with Newtonian theory for smaller systems, such as GCs. MOG produces velocity dispersion predictions for GCs that are independent of the distance from the galactic center, which may not be the case for MOND. New observations of distant GCs may produce strong criteria that can be used to distinguish between competing gravitational theories.

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