Cosmological implications of two conflicting deuterium abundances
نویسندگان
چکیده
منابع مشابه
Cosmological Implications of Two Conflicting Deuterium Abundances
Constraints on big bang nucleosynthesis (BBN) and on cosmological parameters from conflicting deuterium observations in different high red-shift QSO systems are discussed. The high deuterium observations by Carswell et al., Songaila et al., and Rugers & Hogan is consistent with He and Li observations and Standard BBN (Nν =3) and allows Nν ≤ 3.6 at 95% C.L., but is inconsistent with local observ...
متن کاملCosmological Implications of Two Con icting Deuterium Abundances
Constraints on big bang nucleosynthesis (BBN) and on cosmological parameters from con icting deuterium observations in di erent high red-shift QSO systems are discussed. The high deuterium observations by Carswell et al., Songaila et al., and Rugers & Hogan is consistent with He and Li observations and Standard BBN (N =3) and allows N 3:6 at 95% C.L., but is inconsistent with local observations...
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Primordial nucleosynthesis provides (with the microwave background radiation) one of the two quantitative experimental tests of the hot Big Bang cosmological model (versus alternative explanations for the observed Hubble expansion). The standard homogeneous-isotropic calculation fits the light element abundances ranging from 1H at 76% and 4He at 24% by mass through 2H and 3He at parts in 105 do...
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The deuterium abundances inferred from observations of the interstellar medium within 1 – 2 kpc of the Sun range over a factor of three and the corresponding oxygen abundances show an even larger dispersion. While the lower D (and O) abundances likely result from depletion onto dust, the higher D abundances are consistent with the BBN-predicted primordial D abundance and chemical evolution mode...
متن کاملPrimordial Deuterium and Big Bang Nucleosynthesis: A Tale of Two Abundances
Recent confrontations of the predictions of standard big bang nucleosynthesis (SBBN) with the primordial abundances of the light nuclides inferred from observational data reveal a conflict. Simply put, compared to theoretical expectations the inferred primordial abundances of either deuterium or helium-4 (or both) are “too small”. Here I outline the “tension” between D and He in the context of ...
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ژورنال
عنوان ژورنال: Physical Review D
سال: 1997
ISSN: 0556-2821,1089-4918
DOI: 10.1103/physrevd.55.540