Geometrical Effects of Baryon Density Inhomogeneities on Primordial Nucleosynthesis
Geometrical Effects of Baryon Density Inhomogeneities on Primordial Nucleosynthesis
复制标题
重子密度不均匀性对原始核合成的几何效应
DOI：
10.1086/304716
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发表时间：
1996
期刊：
影响因子：
--
通讯作者：
G. J. Mathews
中科院分区：
文献类型：
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作者：
M. Orito;M. Orito;T. Kajino;R. Boyd;G. J. Mathews
我们讨论了涨落几何对原初核合成的影响。第一次，我们考虑凝聚的圆柱和圆柱壳的波动几何形状，除了凝聚的球体和球壳。我们发现，圆柱壳几何可能允许一个明显更高的重子部分的封闭密度（ΩB h 250 0.2）比球非均匀或标准均匀大爆炸模型所允许的。这一结果，这是相反的一些其他最近的研究，是由于几何和最近修订的估计的不确定性，在观测推断的原始轻元素丰度。我们还发现，在圆柱壳几何的非均匀原始核合成可以导致显着的Be和B生产。特别是，这种几何结构产生的原始铍丰度高达[Be] = 12 + log（Be/H）-3，同时仍然满足所有轻元素丰度的限制。
We discuss effects of fluctuation geometry on primordial nucleosynthesis. For the first time we consider condensed cylinder and cylindrical-shell fluctuation geometries in addition to condensed spheres and spherical shells. We find that a cylindrical shell geometry might allow for an appreciably higher baryonic fraction of the closure density (Ωb h250≲0.2) than that allowed in spherical inhomogeneous or standard homogeneous big bang models. This result, which is contrary to those of some other recent studies, is due to both geometry and recently revised estimates of the uncertainties in the observationally inferred primordial light-element abundances. We also find that inhomogeneous primordial nucleosynthesis in the cylindrical shell geometry can lead to significant Be and B production. In particular, this geometry produces a primordial beryllium abundance as high as [Be] = 12 + log (Be/H) ≈ -3 while still satisfying all of the light-element abundance constraints.