Testing modified gravity with globular cluster velocity dispersions

Abstract

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.

4 pages, 2 figures; accepted for publication in ApJ

References in corpus (2)

• Testing modified gravity with motion of satellites around galaxies
• Modified Gravitational Theory and Galaxy Rotation Curves

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• Long-Range Models of Modified Gravity and Their Agreement with Solar System and Double Pulsar Data