Post--Big Bang Processing of the Primordial Elements
نویسندگان
چکیده
منابع مشابه
Post Big Bang Processing of the Primordial Elements
We explore the Gnedin-Ostriker suggestion that a post-Big-Bang photodissociation process may modify the primordial abundances of the light elements. We consider several specific models and discuss the general features that are necessary (but not necessarily sufficient) to make the model work. We find that with any significant processing, the final D and 3 He abundances, which are independent of...
متن کاملPrimordial Big Bang Nucleosynthesis
Big Bang Nucleosynthesis is the theory of the production of the light element isotopes of D, 3He, 4He, and 7Li. After a brief review of the essential elements of the standard Big Bang model at a temperature of about 1 MeV, the theoretical input and predictions of BBN are discussed. The theory is tested by the observational determinations of the light element abundances and the current status of...
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In this paper we review the present status of observations of the Big Bang elements D, 3He, 4He and 7Li and of their extrapolation to the primordial values. It is shown that, within the errors, the abundances are consistent with the predictions of the standard Big Bang nucleosynthesis for 1 ≤ η10 ≤ 6, which corresponds to 0.004 ≤ Ωbh 2 0 ≤ 0.02. Narrower consistencies in η10 are still possible ...
متن کاملPrimordial Lithium and Big Bang Nucleosynthesis.
Recent determinations of the abundance of the light-element Li in very metal-poor stars show that its intrinsic dispersion is essentially zero and that the random error in the estimated mean Li abundance is negligible. However, a decreasing trend in the Li abundance toward lower metallicity indicates that the primordial abundance of Li can be inferred only after allowing for nucleosynthesis pro...
متن کاملIs Primordial 4 He Truly from Big Bang ?
Population III stars are now believed to contribute to the observed Near Infrared Background (NIRB) and heavy element pollution of the intergalactic medium. Here we show that a Pop III contribution to the primordial He abundance consistent with NIRB constraints, might mask a lower value for the Big Bang Nucleosynthesis (BBN) He abundance.
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ژورنال
عنوان ژورنال: The Astrophysical Journal
سال: 1996
ISSN: 0004-637X,1538-4357
DOI: 10.1086/176909