Abstract
We modify the standard code for primordial nucleosynthesis to include the effect of the slight heating of neutrinos by annihilations. There is a small, systematic change in the yield, , which is insensitive to the value of the baryon-to-photon ratio for . We also find that the baryon-to-photon ratio decreases by about 0.5% less than the canonical factor of because some of the entropy in pairs is transferred to neutrinos. These results are in accord with recent analytical estimates.
- Received 3 November 1992
DOI:https://doi.org/10.1103/PhysRevD.47.4309
©1993 American Physical Society