标题： 重子密度不均匀性对原初核合成的几何效应 显示英文标题

标题： Geometrical Effects of Baryon Density Inhomogeneities on Primordial Nucleosynthesis

摘要： 我们讨论了涨落几何对原初核合成的影响。 我们首次考虑了凝聚圆柱体和圆柱壳涨落几何，除此之外还有凝聚球体和球壳。 我们发现，与球状非均匀或标准均匀大爆炸模型允许的相比，圆柱壳几何允许显著更高的重子贡献成为闭合密度（$\Omega_b h_{50}^2 \la 0.2$）。 这一结果与其他一些最近的研究相反，这是由于几何形状以及最近修订的关于观测推断的原始轻元素丰度的不确定性估计。 我们还发现，在圆柱壳几何中的非均匀原初核合成可以导致显著的铍和硼的产生。 特别是，在仍然满足所有轻元素丰度限制的情况下，原始铍丰度高达[Be] = 12 + log(Be/H)$\approx -3$是可能的。 显示英文摘要

摘要： 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 allows for an appreciably higher baryonic contribution to be the closure density ($\Omega_b h_{50}^2 \la 0.2$) than that allowed in spherical inhomogeneous or standard homogeneous big bang models. This result, which is contrary to 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, a primordial beryllium abundance as high as [Be] = 12 + log(Be/H) $\approx -3$ is possible while still satisfying all of the light-element abundance constraints.