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Density perturbations in a two-fluid component Universe

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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≪ρ2, λ1J≪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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Shouping, X. Density perturbations in a two-fluid component Universe. Astrophys Space Sci 111, 171–178 (1985). https://doi.org/10.1007/BF00651526

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  • Dominant Component
  • Density Perturbation
  • Develop Feature
  • Visible Matter
  • Component Universe