Primordial Nucleosynthesis: Theory and Observations

نویسندگان

  • Keith A. Olive
  • Terry P. Walker
چکیده

We review the Cosmology and Physics underlying Primordial Nucleosynthesis and survey current observational data in order to compare the predictions of Big Bang Nucleosynthesis with the inferred primordial abundances. From this comparison we report on the status of the consistency of the standard hot big bang model, we constrain the universal density of baryons (nucleons), and we set limits to the numbers and/or effective interactions of hypothetical new “light” particles (equivalent massless neutrinos).

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Big Bang Nucleosynthesis and Lepton Number Asymmetry in the

Recently it has been reported that there may be a discrepancy between big bang nucleosynthesis theory and observations (BBN crisis). We show that BBN predictions agree with the primordial abundances of light elements, 3 He and 7 Li inferred from the observational data if the electron neutrino has a net chemical potential ξ νe due to lepton asymmetry. We estimate that ξ νe = 0.043 Subject headin...

متن کامل

Big-Bang Nucleosynthesis in Light of Discordant Deuterium Measurements

Two dimensional concordance plots involving the baryon-to-photon ratio, η, and an effective number of light neutrinos, Nν , are used to discuss the overall consistency of standard big-bang nucleosynthesis in light of recent determinations of the primordial deuterium (H) abundance. Observations of high-redshift Ly-α clouds have provided discordant H/H determinations: one cloud with H/H high comp...

متن کامل

Primordial Nucleosynthesis For The New Millennium

The physics of the standard hot big bang cosmology ensures that the early Universe was a primordial nuclear reactor, synthesizing the light nuclides (D, 3 He, 4 He, and 7 Li) in the first 20 minutes of its evolution. After an overview of nucleosynthesis in the standard model (SBBN), the primordial abundance yields will be presented, followed by a status report (intended to stimulate further dis...

متن کامل

Big–bang Nucleosynthesis as a Probe of the Geometry of Superspace

We study the effect from a general ultralocal supermetric on primordial nucleosynthesis for Friedmann-Robertson-Walker Cosmology. The parameter λ of the supermetric changes the effective number of degrees of freedom, g∗, which modifies the Friedmann equation. This modification produces variations in the production of primordial 4He. The observations of the primordial abundances of light element...

متن کامل

Big Bang Nucleosynthesis and Related Observations

The current status of big bang nucleosynthesis is summarized. Particular attention is paid to recent observations of He and Li and their systematic uncertainties. Be and B are also discussed in connection to recent Li observations and the primordial Li abundance.

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

عنوان ژورنال:

دوره   شماره 

صفحات  -

تاریخ انتشار 1999