1 / 20

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.

burton-maynard
Download Presentation

Primordial Nucleosynthesis (K&T chapter 4)

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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

More Related