Effect of neutrino heating on primordial nucleosynthesis.
Effect of neutrino heating on primordial nucleosynthesis.
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中微子加热对原始核合成的影响。
DOI：
10.1103/physrevd.47.4309
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发表时间：
1992
期刊：
影响因子：
--
通讯作者：
M. Turner
中科院分区：
文献类型：
--
作者：
B. Fields;S. Dodelson;M. Turner
我们修改了原始核合成的标准代码，以包括中微子被[数字e][正负]]湮灭轻微加热的影响。[sup 4]He产率[δ][数字Y][同余]+1.5[乘以]10[sup[减]4]，这对10[sup[减]10][约lt][eta][约lt]10[sup[减]9]的重子光子比[eta]的值不敏感。我们还发现重子与光子之比比标准因子4/11降低了约0.5%，因为[ital e][sup[正负]]对中的一些熵被转移到中微子上。这些结果与最近的分析估计相符。
We modify the standard code for primordial nucleosynthesis to include the effect of the slight heating of neutrinos by [ital e][sup [plus minus]] annihilations. There is a small, systematic change in the [sup 4]He yield, [Delta][ital Y][congruent]+1.5[times]10[sup [minus]4], which is insensitive to the value of the baryon-to-photon ratio [eta] for 10[sup [minus]10][approx lt][eta][approx lt]10[sup [minus]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 [ital e][sup [plus minus]] pairs is transferred to neutrinos. These results are in accord with recent analytical estimates.