MG14 - Talk detail

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The currently popular standard model of cosmology is based on an extrapolation by many orders of magnitude in scale of the empirical law of gravitation developed by Newton nearly 400 years ago and rewritten by Einstein in 1916 in terms of a geometrical interpretation, before knowledge of what galaxies are became available. The deviations of the observed dynamics on the scales of galaxies from this extrapolation are commonly thought to be due to the presence of non-relativistic particles which are also hypothetised to not be part of the standard model of particle physics such that they only interact gravitationally with standard particles, and perhaps weakly as well. If such cold or warm dark matter particles exist, then they form vast halos in which galaxies are embedded in. Any two galaxies, when interacting with each other, therefore suffer orbital decay from dynamical friction on their expansive and massive particle dark matter halos. This leads to the profuse merging of galaxies over cosmic time and is the basis of the currently established dominant physical process of how galaxies form and evolve. I will discuss and update a few empirical tests of dynamical friction, proposed by Kroupa (2015), with the conclusion that the observational data consistently do not show evidence for dynamical friction. The implication of this finding is that particle dark matter halos cannot be present. The effective law of gravity thus cannot be Newtonian/Einsteinian on the scales of galaxies and beyond.

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