Cold+hot dark matter and the cosmic microwave background

Journal Article · Thu Aug 01 04:00:00 EDT 1996 · Astrophysical Journal

DOI:https://doi.org/10.1086/177581· OSTI ID:388157

Dodelson, S ^[1]; Gates, E ^[2]; Stebbins, A ^[1]

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1. NASA/Fermilab Astrophysics Center, Fermi National Accelerator Laboratory, Batavia, Illinois 60510-0500 (United States)
2. Department of Astronomy & Astrophysics, Enrico Fermi Institute, University of Chicago, Chicago, Illinois 60637-1433 (United States)

We examine the cosmic microwave background power spectrum for adiabatic models with a massive neutrino component. We present the results of a detailed numerical evolution of cold+hot dark matter (CHDM) models and compare these results with the standard cold dark matter (CDM) spectrum. The difference is of order 5{percent}{endash}10{percent} for 400{lt}{ital l}{lt}1000 for currently popular CHDM models. Using semi-analytic approximations, we also discuss the relevant physics involved. Finally, we remark on the ability of future experiments to differentiate between these models. An all-sky experiment with a beam size smaller than 30{prime} can distinguish between CHDM and CDM if other cosmological parameters are known. Even allowing other parameters to vary, it may be possible to distinguish CDM from CHDM. {copyright} {ital 1996 The American Astronomical Society.}

• OSTI ID: 388157
• Journal Information: Astrophysical Journal, Journal Name: Astrophysical Journal Journal Issue: 1 Vol. 467; ISSN ASJOAB; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
ANISOTROPY
BACKGROUND RADIATION
COSMIC BACKGROUND RADIATION
COSMOLOGICAL MODELS
NONLUMINOUS MATTER
NUMERICAL SOLUTION
POWER SPECTRA