Cold + hot dark matter cosmology with [ital m]([nu][sub [mu]])[approx][ital m]([nu][sub [tau]])[approx]2. 4 eV

Journal Article · Mon Mar 20 04:00:00 EST 1995 · Physical Review Letters; (United States)

DOI:https://doi.org/10.1103/PhysRevLett.74.2160· OSTI ID:6403818

Primack, J R ^[1]; Holtzman, J ^[2]; Klypin, A ^[3]; Caldwell, D O ^[4]

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1. Santa Cruz Institute for Particle Physics, University of California, Santa Cruz, California 95064 (United States)
2. Lowell Observatory, Mars Hill Road, Flagstaff, Arizona 86100 (United States)
3. Department of Astronomy, New Mexico State University, Las Cruces, New Mexico 88001 (United States)
4. Department of Physics, University of California, Santa Barbara, California 93106-9530 (United States)

Cold + hot dark matter (CHDM) [Omega]=1 cosmological models require a total neutrino mass [similar to]5 eV. Because recent data support the [nu][sub [mu]][r arrow][nu][sub [tau]] oscillation explanation of the cosmic ray [nu][sub [mu]] deficit, which requires that [ital m]([nu][sub [mu]])[approx][ital m]([nu][sub [tau]]), this suggests that [ital m]([nu][sub [mu]])[approx][ital m]([nu][sub [tau]])[approx]2.4 eV. The linear calculations and [ital N]-body simulation reported here indicate that an [Omega]=1 CHDM model with two 2.4 eV neutrinos (designated C[nu][sup 2]DM) agrees remarkably well with all available observations, but only if the Hubble parameter [ital h][approx]0.5. We also show that even one 2.4 eV neutrino raises serious difficulties for low-[Omega] flat CDM models.

• OSTI ID: 6403818
• Journal Information: Physical Review Letters; (United States), Journal Name: Physical Review Letters; (United States) Vol. 74:12; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

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662110 -- General Theory of Particles & Fields-- Theory of Fields & Strings-- (1992-)
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72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
COSMIC RADIATION
COSMOLOGICAL MODELS
ELEMENTARY PARTICLES
FERMIONS
IONIZING RADIATIONS
LEPTONS
MASS
MASSLESS PARTICLES
MATHEMATICAL MODELS
NEUTRINO OSCILLATION
NEUTRINOS
RADIATIONS
SIMULATION