Cold + hot dark matter cosmology with [ital m]([nu][sub [mu]])[approx][ital m]([nu][sub [tau]])[approx]2. 4 eV
- Santa Cruz Institute for Particle Physics, University of California, Santa Cruz, California 95064 (United States)
- Lowell Observatory, Mars Hill Road, Flagstaff, Arizona 86100 (United States)
- Department of Astronomy, New Mexico State University, Las Cruces, New Mexico 88001 (United States)
- 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), Vol. 74:12; ISSN 0031-9007
- Country of Publication:
- United States
- Language:
- English
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