Mathematics – Logic
Scientific paper
Mar 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985s%26w....24..132k&link_type=abstract
Sterne und Weltraum (ISSN 0039-1263), vol. 24, March 1985, p. 132-139. In German.
Mathematics
Logic
2
Beta Particles, Chronology, Radioactive Decay, Universe, Chemical Evolution, Cosmology, Heavy Elements, Hubble Constant, Milky Way Galaxy, Neutrinos, Neutron Decay, Nuclear Fusion, Stellar Evolution, Supernovae
Scientific paper
The results of a recent breakthrough in the understanding of the beta decay of neutron-rich atomic nuclei are discussed. The synthesis of heavy elements in the universe via the r-process has been finally explained, and a new 'actinide age' for the Milky Way galaxy of 21 +2 or -5 billion years, supported by the latest astronomic datings, has been arrived at. Along with new values for the Hubble constant, a universal mass density of less than 0.6 times the critical density has been determined, implying an open universe. Comparisons with the observed baryonic mass density gives an upper limit for the neutrino mass of 4.4 eV, which is consistent with the latest experimental results. Assuming the inflationary scenario and consequent Euclidean geometry of the universe, this new age for the universe leads to a nonvanishing cosmological constant in the Friedmann equation and to a vacuum energy density on the order of magnitude of the observed baryonic mass density.
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