Linking Primordial to Solar and Galactic Composition |
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Authors: | Johannes Geiss George Gloeckler |
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Institution: | (1) International Space Science Institute, Hallerstrasse 6, 3012 Bern, Switzerland;(2) Department of Oceanic, Atmospheric and Space Sciences, University of Michigan, Ann Arbor, MI 48109-2143, USA;(3) Department of Physics, University of Maryland, College Park, ML 20742-0001, USA |
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Abstract: | Evolution and composition of baryonic matter is influenced by the evolution of other forms of matter and energy in the universe.
At the time of primordial nucleosynthesis the universal expansion and thus the decrease of the density and temperature of
baryonic matter were controlled by leptons and photons. Non-baryonic dark matter initiated the formation of clusters and galaxies,
and to this day, dark matter largely determines the dynamics and geometries of these baryonic structures and indirectly influences
their chemical evolution. Chemical analyses and isotopic abundance measurements in the solar system established the composition
in the protosolar cloud (PSC). The abundances of nuclear species in the PSC led to the discovery of the magic numbers and
the nuclear shell model, and they allowed the identification of nucleosynthetic sites and processes. To this day, we know
the abundances of the ∼300 stable and long-lived nuclides infinitely better in the PSC than in any other sample of matter
in the universe. Thus, we know the exact composition of a Galactic sample of intermediate age, allowing us to check on theories
of Galactic evolution before and after the formation of the solar system. This paper specifically discusses the nucleosynthesis
in the early universe and the Galactic evolution during the last 5 Gyr. |
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Keywords: | Cosmology: Big Bang Galaxy: Galactic evolution Interstellar Medium: composition |
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