Sharpening the predictions of big-bang nucleosynthesis

Details Sharpening the predictions of big-bang nucleosynthesis Sharpening the predictions of big-bang nucleosynthesis

1999-01-13

arxiv.org/abs/astro-ph/9901157v1

Phys.Rev.Lett. 82 (1999) 4176-4179

Astronomy and Astrophysics

Astrophysics

5 pages, 4 figures (epsfig), REVTeX; submitted to Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.82.4176

Motivated by the recent measurement of the primeval abundance of deuterium, we re-examine the nuclear inputs to big-bang nucleosynthesis (BBN). Using Monte-Carlo realization of the nuclear cross-section data to directly estimate the theoretical uncertainties for the yields of D, 3-He and 7-Li, we show that previous estimates were a factor of 2 too large. We sharpen the BBN determination of the baryon density based upon deuterium, rho_B = (3.6 +/- 0.4) * 10^{-31} g/cm^3 (Omega_B h^2 = 0.019 +/- 0.0024), which leads to a predicted 4-He abundance, Y_P = 0.246 +/- 0.0014 and a stringent limit to the equivalent number of light neutrino species: N_nu < 3.20 (all at 95% cl). The predicted 7-Li abundance, 7-Li/H = (3.5 + 1.1 - 0.9) * 10^{-10}, is higher than that observed in pop II stars, (1.7 +/- 0.3) * 10^{-10} (both, 95% cl). We identify key reactions and the energies where further work is needed.

Affiliated with

Also associated with

No associations

Rating

Sharpening the predictions of big-bang nucleosynthesis does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Sharpening the predictions of big-bang nucleosynthesis, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Sharpening the predictions of big-bang nucleosynthesis will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-559480