Big-bang nucleosynthesis
A critical review is given of the current status of cosmological nucleosynthesis. In the framework of the Standard Model with 3 types of relativistic neutrinos, the baryon-to-photon ratio, $\eta$, corresponding to the inferred primordial abundances of deuterium and helium-4 is consistent with the in...
| Prif Awduron: | , , |
|---|---|
| Awduron Eraill: | |
| Fformat: | Journal article |
| Iaith: | English |
| Cyhoeddwyd: |
IOP Publishing
2014
|
| _version_ | 1826287511426564096 |
|---|---|
| author | Fields, B Molaro, P Sarkar, S |
| author2 | Olive, K |
| author_facet | Olive, K Fields, B Molaro, P Sarkar, S |
| author_sort | Fields, B |
| collection | OXFORD |
| description | A critical review is given of the current status of cosmological nucleosynthesis. In the framework of the Standard Model with 3 types of relativistic neutrinos, the baryon-to-photon ratio, $\eta$, corresponding to the inferred primordial abundances of deuterium and helium-4 is consistent with the independent determination of $\eta$ from observations of anisotropies in the cosmic microwave background. However the primordial abundance of lithium-7 inferred from observations is significantly below its expected value. Taking systematic uncertainties in the abundance estimates into account, there is overall concordance in the range $\eta = (5.7-6.7)\times 10^{-10}$ at 95% CL (corresponding to a cosmological baryon density $\Omega_B h^2 = 0.021 - 0.025$). The D and He-4 abundances, when combined with the CMB determination of $\eta$, provide the bound $N_\nu=3.28 \pm 0.28$ on the effective number of neutrino species. Other constraints on new physics are discussed briefly. |
| first_indexed | 2024-03-07T01:59:46Z |
| format | Journal article |
| id | oxford-uuid:9cf0b9e9-3196-424e-8360-10d352585136 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T01:59:46Z |
| publishDate | 2014 |
| publisher | IOP Publishing |
| record_format | dspace |
| spelling | oxford-uuid:9cf0b9e9-3196-424e-8360-10d3525851362022-03-27T00:39:41ZBig-bang nucleosynthesisJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:9cf0b9e9-3196-424e-8360-10d352585136EnglishSymplectic Elements at OxfordIOP Publishing2014Fields, BMolaro, PSarkar, SOlive, KA critical review is given of the current status of cosmological nucleosynthesis. In the framework of the Standard Model with 3 types of relativistic neutrinos, the baryon-to-photon ratio, $\eta$, corresponding to the inferred primordial abundances of deuterium and helium-4 is consistent with the independent determination of $\eta$ from observations of anisotropies in the cosmic microwave background. However the primordial abundance of lithium-7 inferred from observations is significantly below its expected value. Taking systematic uncertainties in the abundance estimates into account, there is overall concordance in the range $\eta = (5.7-6.7)\times 10^{-10}$ at 95% CL (corresponding to a cosmological baryon density $\Omega_B h^2 = 0.021 - 0.025$). The D and He-4 abundances, when combined with the CMB determination of $\eta$, provide the bound $N_\nu=3.28 \pm 0.28$ on the effective number of neutrino species. Other constraints on new physics are discussed briefly. |
| spellingShingle | Fields, B Molaro, P Sarkar, S Big-bang nucleosynthesis |
| title | Big-bang nucleosynthesis |
| title_full | Big-bang nucleosynthesis |
| title_fullStr | Big-bang nucleosynthesis |
| title_full_unstemmed | Big-bang nucleosynthesis |
| title_short | Big-bang nucleosynthesis |
| title_sort | big bang nucleosynthesis |
| work_keys_str_mv | AT fieldsb bigbangnucleosynthesis AT molarop bigbangnucleosynthesis AT sarkars bigbangnucleosynthesis |