Comparing the new MOG theory with dark matter approach in extragalactic context

Distribution of dark matter in Universe is a long-standing problem of astrophysics and cosmology. Flat rotation curves of galaxies belong to one of the most significant observations supporting dark matter theory. However, there are other alternative approaches to gravity. In this work, we confront the rotation curves of observed galaxies with predictions of dark matter approach and a new modified gravitational (MOG) theory We take into account MOG theory based on observational results of McGaugh et al. (2016). The generalization of the new MOG theory allows to determine the rotation curve of galaxies from an arbitrary given gravitational potential. We fit the latest observational values of the rotational speed of the Milky Way galaxy with minimal deviations. Moreover, we examine the theory on a larger sample, we apply the method on acceleration of galaxies from the SPARC catalogue. We compare the results with the dark matter approach as well.

McGaugh et al., 2016. PRL, 117(20), p.201101.