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A Newtonian Approach to the Cosmological
Dark Fluids
A. Aviles, J.L. Cervantes-Cota, J. Klapp, O. Luongo and H. Quevedo
Abstract
We review the hydrodynamics of the dark sector components in
Cosmology. For this purpose we use the approach of Newtonian gravitational insta-
bility, and thereafter we add corrections to arrive to a full relativistic description.
In Cosmology and Astrophysics, it is usual to decompose the dark sector into two
species, dark matter and dark energy. We will use instead a unified approach by
describing a single unified dark fluid with very simple assumptions, namely that the
dark fluid is barotropic and that its sound speed vanishes.
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