Effect of Neutrino Heating on Primordial Nucleosynthesis

Details Effect of Neutrino Heating on Primordial Nucleosynthesis Effect of Neutrino Heating on Primordial Nucleosynthesis

1992-10-31

arxiv.org/abs/astro-ph/9210007v1

Phys.Rev. D47 (1993) 4309-4314

Astronomy and Astrophysics

Astrophysics

14 pages/4 Figs (upon request)

Scientific paper

10.1103/PhysRevD.47.4309

We have modified the standard code for primordial nucleosynthesis to include the effect of the slight heating of neutrinos by $e^\pm$ annihilations. There is a small, systematic change in the $^4$He yield, $\Delta Y \simeq +1.5\times 10^{-4}$, which is insensitive to the value of the baryon-to-photon ratio $\eta$ for $10^{-10}\la \eta \la 10^{-9}$. We also find that the baryon-to-photon ratio decreases by about 0.5\% less than the canonical factor of 4/11 because some of the entropy in $e^\pm$ pairs is transferred to neutrinos. These results are in accord with recent analytical estimates.

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