sci.physics.research

See this paper by Scarpa et. al.

/abs/

Quoting abstract:

"We report on the results from an ongoing program aimed at testing
Newton's law of gravity in the low acceleration regime using globular
clusters. It is shown that all clusters studied so far do behave like
galaxies, that is, their velocity dispersion profile flattens out at
large radii where the acceleration of gravity goes below 1e-8 cm/s/s,
instead of following the expected Keplerian fall off. In galaxies this
behavior is ascribed to the existence of a dark matter halo. Globular
clusters, however, do not contain dark matter, hence this result might
indicate that our present understanding of gravity in the weak regime
of accelerations is incomplete and somehow incorrect."

Cooperstock and Tieu had previously understood the "anomalous"
rotation curves of galaxies as a misapplication of GR. This work of
theirs is on-going - here is another fertile field for modeling, using
their ideas.

-drl