Proton Neutron

A new model without dark matter for the rotation of spiral galaxies: the connections among shape, kinematics and evolution.

It is proposed that the arms of spiral galaxies are formed by the continuous outflow of matter from their centers. It is then shown that the ratio between the radial and tangential velocities of the outflow is the parameter responsible for the logarithmic spiral structure of spiral galaxies. The fitting of some spiral galaxies to the model allows the calculation of the radial velocities of matter in these galaxies and such values completely agree with the observational data. An approximate universal equation is proposed for the description of the arms of spiral galaxies with or without bars. Some important consequences are discussed with respect to dark matter, galactic evolution and cosmology. It is particularly  concluded that dark matter does not exist in spiral galaxies.   A preliminary version of the paper  was presented in a plenary talk in the San Marino Workshop on Astrophysics and Cosmology for Matter and Antimatter, September 5 to 9, 2011, San Marino. An improved version of the paper was  presented at the American Physical Society (APS) April 2013 Meeting, Denver, Colorado, USA and immediately afterwards the paper was finally published. You can access the paper by clicking here and its erratum by clicking Erratum Spiral Galaxies.