Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1994-12-05
Phys.Rev. D52 (1995) 6700-6707
Physics
High Energy Physics
High Energy Physics - Phenomenology
25 pages, latex, revised version to appear in Phys. Rev. D52 (1995): contains an expanded and clarified discussion of the part
Scientific paper
10.1103/PhysRevD.52.6700
Increasing improvements in the independent determinations of the Hubble constant and the age of the universe now seem to indicate that we need a small non-vanishing cosmological constant to make the two independent observations consistent with each other. The cosmological constant can be physically interpreted as due to the vacuum energy of quantized fields. To make the cosmological observations consistent with each other we would need a vacuum energy density, $ \rho_v \sim (10^{-3} eV)^4 $ today ( in the cosmological units $ \hbar=c=k=1 $ ). It is argued in this article that such a vacuum energy density is natural in the context of phase transitions linked to massive neutrinos. In fact, the neutrino masses required to provide the right vacuum energy scale to remove the age Vs Hubble constant discrepancy are consistent with those required to solve the solar neutrino problem by the MSW mechanism.
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