Retardation Effects in Gravitation

TL;DR

This paper proposes that considering retardation effects in general relativity can explain galactic rotation velocities without invoking dark matter, challenging conventional models.

Contribution

It introduces the idea that retardation effects in gravity, often neglected, can account for galactic rotation curves within standard physics.

Findings

Retardation effects influence galactic dynamics.

Dark matter may not be necessary to explain rotation velocities.

General relativity can explain observations without modifications.

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.