No Crisis for Big Bang Nucleosynthesis
Contrary to a recent claim, the inferred primordial abundances of the light elements are quite consistent with the expectations from standard big bang nucleosynthesis when attention is restricted to direct observations rather than results from chemical evolution models. The number of light neutrino...
| Príomhchruthaitheoirí: | , |
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| Formáid: | Journal article |
| Teanga: | English |
| Foilsithe / Cruthaithe: |
1996
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| _version_ | 1826296492663504896 |
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| author | Kernan, P Sarkar, S |
| author_facet | Kernan, P Sarkar, S |
| author_sort | Kernan, P |
| collection | OXFORD |
| description | Contrary to a recent claim, the inferred primordial abundances of the light elements are quite consistent with the expectations from standard big bang nucleosynthesis when attention is restricted to direct observations rather than results from chemical evolution models. The number of light neutrino (or equivalent particle) species ($N_\nu$) can be as high as 4.53 if the nucleon-to-photon ratio ($\eta$) is at its lower limit of $1.65 \times 10^{-10}$, as constrained by the upper bound on the deuterium abundance in high redshift quasar absorption systems. Alternatively, with $N_\nu = 3$, $\eta$ can be as high as $8.90 \times 10^{-10}$ if the deuterium abundance is bounded from below by its interstellar value. |
| first_indexed | 2024-03-07T04:17:11Z |
| format | Journal article |
| id | oxford-uuid:c9c77584-a14c-4780-986f-f9ec7e524ec0 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T04:17:11Z |
| publishDate | 1996 |
| record_format | dspace |
| spelling | oxford-uuid:c9c77584-a14c-4780-986f-f9ec7e524ec02022-03-27T07:02:12ZNo Crisis for Big Bang NucleosynthesisJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:c9c77584-a14c-4780-986f-f9ec7e524ec0EnglishSymplectic Elements at Oxford1996Kernan, PSarkar, SContrary to a recent claim, the inferred primordial abundances of the light elements are quite consistent with the expectations from standard big bang nucleosynthesis when attention is restricted to direct observations rather than results from chemical evolution models. The number of light neutrino (or equivalent particle) species ($N_\nu$) can be as high as 4.53 if the nucleon-to-photon ratio ($\eta$) is at its lower limit of $1.65 \times 10^{-10}$, as constrained by the upper bound on the deuterium abundance in high redshift quasar absorption systems. Alternatively, with $N_\nu = 3$, $\eta$ can be as high as $8.90 \times 10^{-10}$ if the deuterium abundance is bounded from below by its interstellar value. |
| spellingShingle | Kernan, P Sarkar, S No Crisis for Big Bang Nucleosynthesis |
| title | No Crisis for Big Bang Nucleosynthesis |
| title_full | No Crisis for Big Bang Nucleosynthesis |
| title_fullStr | No Crisis for Big Bang Nucleosynthesis |
| title_full_unstemmed | No Crisis for Big Bang Nucleosynthesis |
| title_short | No Crisis for Big Bang Nucleosynthesis |
| title_sort | no crisis for big bang nucleosynthesis |
| work_keys_str_mv | AT kernanp nocrisisforbigbangnucleosynthesis AT sarkars nocrisisforbigbangnucleosynthesis |