On the radial acceleration of disk galaxies

TL;DR

This paper explores an alternative impact theory of gravitation to explain the rotation curves of disk galaxies without dark matter, successfully fitting observational data for five galaxies.

Contribution

It demonstrates that impact theory of gravitation can model galaxy rotation curves without dark matter, extending previous work to additional galaxies.

Findings

Good fits to observed velocities without dark matter

Successful modeling of extraplanar matter in NGC 3198

Supports impact theory as a viable alternative to dark matter and MOND

Abstract

The physical processes defining the dynamics of disk galaxies are still poorly understood. Hundreds of articles have appeared in the literature over the last decades without arriving at an understanding within a consistent gravitational theory. Dark matter (DM) scenarios or a modification of Newtonian dynamics (MOND) are employed to model the non-Keplerian rotation curves in most of the studies, but the nature of DM and its interaction with baryonic matter remains an open question and MOND formulates a mathematical concept without a physical process. We have continued our attempts to use the impact theory of gravitation for a description of the peculiar acceleration and velocity curves and have considered five more galaxies. Using published data of the galaxies NGC 3198, NGC 2403, NGC 1090, UGC 3205 and NGC 1705, it has been possible to find good fits without DM for the observed disk velocities and, as example, also for the extraplanar matter of NGC 3198.