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Universe 2017, 3(2), 44; doi:10.3390/universe3020044

Nucleosynthesis Predictions and High-Precision Deuterium Measurements

Institute of Theoretical Astrophysics, The University of Oslo, Boks 1072 Blindern, NO-0316 Oslo, Norway
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Academic Editors: Mariusz P. Dąbrowski, Manuel Krämer and Vincenzo Salzano
Received: 9 January 2017 / Revised: 25 April 2017 / Accepted: 3 May 2017 / Published: 9 May 2017
(This article belongs to the Special Issue Varying Constants and Fundamental Cosmology)
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Abstract

Two new high-precision measurements of the deuterium abundance from absorbers along the line of sight to the quasar PKS1937–1009 were presented. The absorbers have lower neutral hydrogen column densities (N(HI) ≈ 18 cm 2 ) than for previous high-precision measurements, boding well for further extensions of the sample due to the plenitude of low column density absorbers. The total high-precision sample now consists of 12 measurements with a weighted average deuterium abundance of D/H = 2 . 55 ± 0 . 02 × 10 5 . The sample does not favour a dipole similar to the one detected for the fine structure constant. The increased precision also calls for improved nucleosynthesis predictions. For that purpose we have updated the public AlterBBN code including new reactions, updated nuclear reaction rates, and the possibility of adding new physics such as dark matter. The standard Big Bang Nucleosynthesis prediction of D/H = 2 . 456 ± 0 . 057 × 10 5 is consistent with the observed value within 1.7 standard deviations. View Full-Text
Keywords: (cosmology:) cosmological parameters; (cosmology:) primordial nucleosynthesis; (galaxies:) quasars: absorption lines; nuclear reactions; nucleosynthesis; abundances (cosmology:) cosmological parameters; (cosmology:) primordial nucleosynthesis; (galaxies:) quasars: absorption lines; nuclear reactions; nucleosynthesis; abundances
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Riemer-Sørensen, S.; Jenssen, E.S. Nucleosynthesis Predictions and High-Precision Deuterium Measurements. Universe 2017, 3, 44.

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