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Primordial Nucleosynthesis (K&T chapter 4)

Primordial Nucleosynthesis (K&T chapter 4). Kinetic eqm, nuclear species A(Z) with mass A and charge Z:. Chemical eqm:. Binding energy:. Mass fraction:. N => all nucleons. Eqm result:. Binding energies of some light nuclei. Phase 1: Nuclear statistical eqm in the early universe.

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Primordial Nucleosynthesis (K&T chapter 4)

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  1. Primordial Nucleosynthesis (K&T chapter 4)

  2. Kinetic eqm, nuclear species A(Z) with mass A and charge Z: Chemical eqm: Binding energy: Mass fraction: N => all nucleons Eqm result:

  3. Binding energies of some light nuclei

  4. Phase 1: Nuclear statistical eqm in the early universe T>> 1MeV Free protons and neutrons Eqm maintained by

  5. Phase 2: Nuclear statistical eqm in the early universe T<< 1MeV Free protons and neutrons

  6. Phase 3: Formation of light elements 0.1MeV < T < 0.3MeV Essentially all n’s bind into He (7:1 ratio of p:n He 25% by mass)

  7. Time

  8. EQM

  9. N

  10. Measurements of primordial Helium Figure from K. Olive in the proceedings of the Texas Symposium astro-ph/9903309

  11. Nitrogen is not primordial Figure from K. Olive in the proceedings of the Texas Symposium astro-ph/9903309

  12. BBN Predictions and Observations Figure from K. Olive in the proceedings of the Texas Symposium astro-ph/9903309

  13. Big Bang Nucleosynthesis: Predictions and observations Tytler et al 00

  14. Around 2001(astro-ph/0102152): Conflicting data

  15. WMAP Bennett et al Feb 11 ‘03 I.1 Successes

  16. Big Bang Nucleosynthesis: Predictions and observations 1-sigma WMAP analysis Tytler et al 00

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