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

Abstract

The cold dark matter (CDM) scenario for structure formation in the Universe is very attractive and has many successes; however, when its spectrum of density perturbations is normalized to the COBE anisotropy measurement the level of inhomogeneity predicted on small scales is too large. This can be remedied 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 the total energy density in relativistic particles to be doubled without interfering with nucleosynthesis. The anisotropies predicted on the degree scale for ``$\tau$CDM'' are larger than standard CDM. Experiments at $e^{\pm }$ colliders may be able to probe such a mass range.

arXiv comment9 pages LaTeX plus 4 figures (available upon request) FERMILAB--Pub--94/026-A

References in corpus (8)

• Reconstructing the linear power spectrum of cosmological mass fluctuations
• COBE, Gravitational Waves, Inflation and Extended Inflation
• Cosmic Microwave Background Probes Models of Inflation
• Structure Formation with Cold + Hot Dark Matter
• The gravitational wave contribution to CMB anisotropies and the amplitude of mass fluctuations from COBE results
• Primordial Nucleosynthesis with a Decaying Tau Neutrino
• Microwave Anisotropies in the Light of COBE
• Large- and Small-Scale Constraints on Power Spectra in $\Omega =1$ Universes

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