Fluctuation evolution in a two-component dark-matter model

Details Fluctuation evolution in a two-component dark-matter model Fluctuation evolution in a two-component dark-matter model

May 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...146..235v&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 146, no. 2, May 1985, p. 235-241.

Astronomy and Astrophysics

Astrophysics

50

Astronomical Models, Cosmology, Dark Matter, Density Distribution, Galactic Evolution, Interstellar Matter, Mass Distribution, Collisionless Plasmas, Quantum Theory

Scientific paper

The evolution of adiabatic perturbations in a scenario dominated by dark matter made of two kinds of collisionless quanta of different masses are investigated. These masses are taken around 10 eV (massive nu) and in the keV range (X-particles, tentatively photinos). Nu-dominated and X-dominated cases are considered. While the nu component moderately alters the dynamics of X-dominated models, it is found that the presence of X-particles, even as a minor component of dark mass, can lead to a drastic modification of the density fluctuation spectra, at the beginning of nonlinear stages. Nu and X spectra become equal before nonlinear collapses start. The possibility of double pancaking (dissipative and nondissipative) over two different scales seems to have to be discarded, in the frame of the present models.

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