Copi C J, Schramm D N, Turner M S
Department of Physics, University of Chicago, IL 60637-1433.
Science. 1995 Jan 13;267(5195):192-9. doi: 10.1126/science.7809624.
For almost 30 years, the predictions of big-bang nucleosynthesis have been used to test the big-bang model to within a fraction of a second of the bang. The agreement between the predicted and observed abundances of deuterium, helium-3, helium-4, and lithium-7 confirms the standard cosmology model and allows accurate determination of the baryon density, between 1.7 x 10(-31) and 4.1 x 10(-31) grams per cubic centimeter (corresponding to about 1 to 15 percent of the critical density). This measurement of the density of ordinary matter is pivotal to the establishment of two dark-matter problems: (i) most of the baryons are dark, and (ii) if the total mass density is greater than about 15 percent of the critical density, as many determinations indicate, the bulk of the dark matter must be "non-baryonic," composed of elementary particles left from the earliest moments.
近30年来，大爆炸核合成的预测结果一直被用于在大爆炸后不到一秒的时间范围内检验大爆炸模型。氘、氦 - 3、氦 - 4和锂 - 7的预测丰度与观测丰度之间的一致性证实了标准宇宙学模型，并能精确测定重子密度，其范围在每立方厘米1.7×10⁻³¹至4.1×10⁻³¹克之间（相当于临界密度的约1%至15%）。对普通物质密度的这一测量对于两个暗物质问题的确定至关重要：（i）大多数重子是暗的；（ii）如果总质量密度如许多测定结果所示大于临界密度的约15%，那么大部分暗物质必定是“非重子的”，由宇宙早期遗留下来的基本粒子组成。
