Density perturbations in a two-fluid component universe

Details Density perturbations in a two-fluid component universe Density perturbations in a two-fluid component universe

Apr 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985ap%26ss.111..171s&link_type=abstract

Astrophysics and Space Science (ISSN 0004-640X), vol. 111, no. 1, April 1985, p. 171-178. Research supported by the Internationa

Astronomy and Astrophysics

Astrophysics

3

Cosmology, Mass Distribution, Neutrinos, Perturbation Theory, Two Fluid Models, Universe, Adiabatic Conditions, Dark Matter, Gravitation Theory, Gravitinos, Interstellar Matter, Jeans Theory, Space Density

Scientific paper

The development of density perturbations in a two-fluid component universe consisting of fluids of visible matter and neutrinos is studied. The equations of density perturbations are developed and solved, and it is found that, independently of whether the initial perturbation exists in one component or the other, the final result is that the inhomogeneity in the visible matter is always larger than that in the neutrinos. Moreover, the increase in perturbations is not monotonous but oscillatory, and such oscillations in the two components are mainly contrary. This suggests that areas with few visible objects, such as voids, may be the sites of clustered dark matter.

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