Gravitational instability for a multifluid medium in an expanding universe

Details Gravitational instability for a multifluid medium in an expanding universe Gravitational instability for a multifluid medium in an expanding universe

Sep 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983ncimb..77..111f&link_type=abstract

Nuovo Cimento B, Serie 11, vol. 77 B, Sept. 11, 1983, p. 111-127.

Mathematics

Logic

15

Big Bang Cosmology, Galactic Evolution, Gravitation Theory, Magnetohydrodynamic Stability, Two Fluid Models, Universe, Continuum Mechanics, Electromagnetic Fields, Galactic Clusters, Helium, Hydrogen, Neutrinos, Newton Theory, Unified Field Theory

Scientific paper

The gravitational clustering of a multicomponent fluid in an expanding Newtonian universe is considered, taking into account the mutual gravitational interactions of the medium. A set of exact and approximate solutions for two fluid components and for several fluid components is obtained; primordial hydrogen and helium or cosmological massive neutrinos of different masses and/or velocity distribution may be described by these solutions. The ratio between the two fluid perturbations, even if originally equal to unity, changes monotonically with time; this phenomenon leads to different epochs for nonlinear clustering that may be reflected into different epochs of galaxy formation.

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