The cosmological decrease of galactic density and the induced retarded gravity effect on rotation curves

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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.

Original languageEnglish
Article number012002
JournalJournal of Physics: Conference Series
Issue number1
StatePublished - 14 Jul 2021
Event12th Biennial Conference on Classical and Quantum Relativistic Dynamics of Particles and Fields, IARD 2020 - Prague, Virtual, Czech Republic
Duration: 1 Jun 20204 Jun 2020

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


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