Is a Massive Tau Neutrino Just What Cold Dark Matter Needs? | Zendy

Scott Dodelson | Zendy; G. Gyuk | Zendy; Michael S. Turner | Zendy

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Is a Massive Tau Neutrino Just What Cold Dark Matter Needs?

Author(s) -

Scott Dodelson,

G. Gyuk,

Michael S. Turner

Publication year - 1994

Publication title -

physical review letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 3.688

H-Index - 673

eISSN - 1079-7114

pISSN - 0031-9007

DOI - 10.1103/physrevlett.72.3754

Subject(s) - physics , neutrino , cold dark matter , dark matter , sterile neutrino , warm dark matter , tau neutrino , anisotropy , nucleosynthesis , particle physics , cosmic neutrino background , hot dark matter , astrophysics , electron neutrino , structure formation , universe , cosmology , cosmic ray , nuclear physics , dark energy , neutrino oscillation , neutrino detector , stars , galaxy , quantum mechanics

The cold dark matter (CDM) scenario for structure formation in the Universeis very attractive and has many successes; however, when its spectrum ofdensity perturbations is normalized to the COBE anisotropy measurement thelevel of inhomogeneity predicted on small scales is too large. This can beremedied by a tau neutrino of mass $1\MeV - 10\MeV$ and lifetime $0.1\sec -100\sec$ whose decay products include electron neutrinos because it allows thetotal energy density in relativistic particles to be doubled withoutinterfering with nucleosynthesis. The anisotropies predicted on the degreescale for ``$\tau$CDM'' are larger than standard CDM. Experiments at $e^\pm$colliders may be able to probe such a mass range.Comment: 9 pages LaTeX plus 4 figures (available upon request) FERMILAB--Pub--94/026-

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