2018/05/27 by Mads T. Frandsen, Jonas Petersen, Frandsen, Mads T. +1
Physics and Astronomy · #Astrophysics of Galaxies (astro-ph.GA) #Cosmology and Gravitation Theories #Dark Matter and Cosmic Phenomena #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #Scientific Research and Discoveries
paper · pdf · doi:10.48550/arxiv.1805.10706
openalex publication_date 2018/05/27 · openalex created_date 2018/06/01 · openalex updated_date 2026/07/28
We study geometries of galactic rotation curves from Dark Matter (DM) and Modified Newtonian Dynamics (MOND) models in (g\rm bar,g\rm tot)-space (g2-space) where g\rm tot is the total centripetal acceleration of matter in the galaxies and g\rm bar is that due to the baryonic (visible) matter assuming Newtonian gravity. The g2-space geometries of the models and data from the SPARC database are classified and compared in a rescaled g2-space that reduces systematic uncertainties on galaxy distance, inclination angle and variations in mass to light ratios. We find that MOND modified inertia models, frequently used to fit rotation curve data, are disfavoured at more than 5σ independent of model details. The Bekenstein-Milgrom formulation of MOND modified gravity compares better with data in the analytic approximation we use. However a quantitative comparison with data is beyond the scope of the paper due to this approximation. NFW DM profiles only agree with a minority of galactic rotation curves. Improved measurements of rotation curves, in particular at radii below the maximum of the total and the baryonic accelerations of the curves are very important in discriminating models aiming to explain the missing mass problem on galactic scales.