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..171x&link_type=abstract

Astrophysics and Space Science, Vol. 111, No. 1, p. 171 - 178

Astronomy and Astrophysics

Astrophysics

2

Universe:Density Perturbations

Scientific paper

In a two-fluid component universe consisting of visible matter and neutrinos, the developed features of perturbations in the two components are quite different. If the densities ρ1 and ρ2, and the Jeans lengths λ1J and λ2J of the two components satisfy the relations ρ1 very low ρ2, λ1J very low λ2J, the developed inhomogeneities in the non-dominant component 1 are larger than those in the dominant component 2. Moreover, the increase of perturbations is in some situations not monotonous but oscillatory, and such oscillations in the two components are contrary.

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