Version 1
: Received: 1 February 2021 / Approved: 2 February 2021 / Online: 2 February 2021 (19:11:18 CET)
How to cite:
Yahalom, A. The Cosmological Decrease of Galactic Density and the Induced Retarded Gravity Effect on Rotation Curves. Preprints2021, 2021020097. https://doi.org/10.20944/preprints202102.0097.v1
Yahalom, A. The Cosmological Decrease of Galactic Density and the Induced Retarded Gravity Effect on Rotation Curves. Preprints 2021, 2021020097. https://doi.org/10.20944/preprints202102.0097.v1
Yahalom, A. The Cosmological Decrease of Galactic Density and the Induced Retarded Gravity Effect on Rotation Curves. Preprints2021, 2021020097. https://doi.org/10.20944/preprints202102.0097.v1
APA Style
Yahalom, A. (2021). The Cosmological Decrease of Galactic Density and the Induced Retarded Gravity Effect on Rotation Curves. Preprints. https://doi.org/10.20944/preprints202102.0097.v1
Chicago/Turabian Style
Yahalom, A. 2021 "The Cosmological Decrease of Galactic Density and the Induced Retarded Gravity Effect on Rotation Curves" Preprints. https://doi.org/10.20944/preprints202102.0097.v1
Abstract
Galaxies are huge physical systems having dimensions of many tens of thousands of light years. Thus any change at the galactic center will be noticed at the rim only tens of thousands of years later. Those retardation effects seems to be neglected in present day galactic modelling used to calculate rotational velocities of matter in the rims of the galaxy and surrounding gas. The significant differences between the predictions of Newtonian instantaneous action at a distance and observed velocities are usually explained by either assuming dark matter or by modifying the laws of gravity (MOND). In this paper we will show that taking general relativity seriously without neglecting retardation effects one can explain the radial velocities of galactic matter without postulating dark matter. However, this will rely on a temporal change of galactic mass. We will compare two different mechanisms of density change, one is local, that is accretion of matter from the intergalactic medium. The other is global, that is the cosmological decrease of density due to the cosmic expansion. It will be shown that local effects are much more important in this respect.
Keywords
dark matter; cosmology; retardation
Subject
Physical Sciences, Acoustics
Copyright:
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
