Cosmic microwave anisotropies and large-scale velocity fields in isocurvature hot dark matter models

Journal Article · Wed Mar 01 04:00:00 EST 1989 · Astrophys. J.; (United States)

DOI:https://doi.org/10.1086/185397· OSTI ID:6067678

Sugiyama, N; Sasaki, M; Tomita, K

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. 23 references.

• Research Organization: Hiroshima Univ., Takehara (Japan)
• OSTI ID: 6067678
• Journal Information: Astrophys. J.; (United States), Journal Name: Astrophys. J.; (United States) Vol. 338; ISSN ASJOA
• Country of Publication: United States
• Language: English

Related Subjects

640106* -- Astrophysics & Cosmology-- Cosmology
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ADIABATIC PROCESSES
ANISOTROPY
BACKGROUND RADIATION
COSMOLOGY
DENSITY
ELECTROMAGNETIC RADIATION
MATHEMATICAL MODELS
MICROWAVE RADIATION
NONLUMINOUS MATTER
PERTURBATION THEORY
PHYSICAL PROPERTIES
RADIATIONS
RELICT RADIATION
UNIVERSE
VELOCITY