http://arxiv.org/abs/1808.06923
We examine the viability of Weyl conformal gravity as an alternative to the general theory of relativity. By using the extended rotation curve of the Milky Way and velocity dispersions of four globular clusters, we show that Weyl gravity predictions without resorting to dark matter comply with observations at the galactic scale. For the Milky Way, we demonstrate that the uncertainty in baryonic modelling results a bracket of possible rotational velocities which well encompasses the diversity in rotation curve construction. Such diversity generally arises from differences in measurements of velocity anisotropy parameter, and the circular speed and galactocentric distance of the Sun. However, we find that Weyl gravity fails to yield the inferred acceleration profile of Abell cluster 1689 which is consistent with previous studies in galaxy clusters.
K. Dutta and T. Islam
Wed, 22 Aug 18
10/62
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