Nucleosynthesis Predictions and High-Precision Deuterium Measurements
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 fur...
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| Format: | Article |
| Language: | English |
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MDPI AG
2017-05-01
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| Series: | Universe |
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| Online Access: | http://www.mdpi.com/2218-1997/3/2/44 |
| _version_ | 1797999199973801984 |
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| author | Signe Riemer-Sørensen Espen Sem Jenssen |
| author_facet | Signe Riemer-Sørensen Espen Sem Jenssen |
| author_sort | Signe Riemer-Sørensen |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-04-11T11:00:55Z |
| format | Article |
| id | doaj.art-6a17dd373f6741e2b3539a75bdb35dfc |
| institution | Directory Open Access Journal |
| issn | 2218-1997 |
| language | English |
| last_indexed | 2024-04-11T11:00:55Z |
| publishDate | 2017-05-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Universe |
| spelling | doaj.art-6a17dd373f6741e2b3539a75bdb35dfc2022-12-22T04:28:37ZengMDPI AGUniverse2218-19972017-05-01324410.3390/universe3020044universe3020044Nucleosynthesis Predictions and High-Precision Deuterium MeasurementsSigne Riemer-Sørensen0Espen Sem Jenssen1Institute of Theoretical Astrophysics, The University of Oslo, Boks 1072 Blindern, NO-0316 Oslo, NorwayInstitute of Theoretical Astrophysics, The University of Oslo, Boks 1072 Blindern, NO-0316 Oslo, NorwayTwo 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.http://www.mdpi.com/2218-1997/3/2/44(cosmology:) cosmological parameters(cosmology:) primordial nucleosynthesis(galaxies:) quasars: absorption linesnuclear reactionsnucleosynthesisabundances |
| spellingShingle | Signe Riemer-Sørensen Espen Sem Jenssen Nucleosynthesis Predictions and High-Precision Deuterium Measurements Universe (cosmology:) cosmological parameters (cosmology:) primordial nucleosynthesis (galaxies:) quasars: absorption lines nuclear reactions nucleosynthesis abundances |
| title | Nucleosynthesis Predictions and High-Precision Deuterium Measurements |
| title_full | Nucleosynthesis Predictions and High-Precision Deuterium Measurements |
| title_fullStr | Nucleosynthesis Predictions and High-Precision Deuterium Measurements |
| title_full_unstemmed | Nucleosynthesis Predictions and High-Precision Deuterium Measurements |
| title_short | Nucleosynthesis Predictions and High-Precision Deuterium Measurements |
| title_sort | nucleosynthesis predictions and high precision deuterium measurements |
| topic | (cosmology:) cosmological parameters (cosmology:) primordial nucleosynthesis (galaxies:) quasars: absorption lines nuclear reactions nucleosynthesis abundances |
| url | http://www.mdpi.com/2218-1997/3/2/44 |
| work_keys_str_mv | AT signeriemersørensen nucleosynthesispredictionsandhighprecisiondeuteriummeasurements AT espensemjenssen nucleosynthesispredictionsandhighprecisiondeuteriummeasurements |