A two-component dark matter universe. II - Linear fluctuation theory

Details A two-component dark matter universe. II - Linear fluctuation theory A two-component dark matter universe. II - Linear fluctuation theory

Jan 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...324...35i&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 324, Jan. 1, 1988, p. 35-45. NSF-supported research.

Astronomy and Astrophysics

Astrophysics

8

Astronomical Models, Cosmology, Dark Matter, Fluctuation Theory, Linear Equations, Universe, Background Radiation, Cosmic Rays, Microwaves

Scientific paper

The development of linear fluctuations is studied in a universe dominated by two components consisting of hot and cold particles. The initial fluctuation amplitudes in the two species at t(eq) are comparable. This is related to suitable choices of the fluctuation levels of the associated linearly independent adiabatic and isocurvature modes. Below the cutoff mass the fluctuations in the hot particles are driven by the gravity of the existing cold particle fluctuations. Detailed analytic and numerical calculations are given that exhaustively describe the behavior of the two-component fluctuations over a wide range of parameters. Implications for large-scale structure, large-scale streaming motions, and the microwave background are briefly noted.

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