Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...338l..45s&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 338, March 15, 1989, p. L45-L48.
Astronomy and Astrophysics
Astrophysics
15
Astronomical Models, Background Radiation, Cosmology, Dark Matter, Microwaves, Perturbation Theory, Universe, Velocity Distribution
Scientific paper
The evolution of isocurvature density perturbations in a universe dominated by hot dark matter (HDM) is studied and anisotropies in the cosmic microwave background and large-scale peculiar velocity fields are evaluated. Isocurvature HDM models are more viable than adiabatic HDM models in that the former can account for relatively large velocity fields on large scales while keeping the cosmic microwave background anisotropies below the observational upper limits as compared to the latter. However, isocurvature HDM models would still have difficulties if the actual velocity fields on scales greater than 50/h Mpc were confirmed to be substantially greater than about 400 km/s.
Sasaki Misao
Sugiyama Naoshi
Tomita Kenji
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