In our previous publications we showed that the ether is an elastic medium of which the field of the relative displacement of its points is governed by the Navier-Stokes-Durand equation of elasticity, by the continuity equation, and by a supplementary equation called the divergence equation, and considered the case where . It appears then that the ether density is the constant of the free ether, and that these equations yield: the fields and the particles constitutions, the electron spin, the “strong nuclear interaction”, the quantum mechanics, and that the electromagnetic potential tensor is Newton’s approximation of Einstein’s fundamental tensor . In the present paper, we consider that the medium is submitted a density of irrotational forces f which implies that . It appears that for specific values of f, the density of the ether is greater than , this implies that the velocity of a particle of a given energy is greater, while the light velocity is smaller, than it would be in the free ether. We consider that this particle is a star in a galaxy. Therefore, a domain of the ether in which may be considered as constituted by “dark matter” since dark matter is defined by the fact that the velocity of a star of a given total energy is larger than would be the velocity of this star of same total energy in the ether free of dark matter. This fact appears in the rotation velocity of the external part of some galaxies.
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