缓慢演化宇宙学中的核合成
Nucleosynthesis in slowly evolving Cosmologies
摘要：
我们探讨宇宙核合成方面的FRW宇宙中的尺度因子随时间线性演变：$a(t) \sim t$。当核合成发生时，轻子数密度较高，碰撞核的库仑势将被屏蔽。这将导致核合成速率的显著增强。我们演示了如何足够的量的$^4He$和collataral金属丰度，接近金属贫Pop II恒星和云中观察到的最低金属丰度，可以产生这样的演变。
英文摘要：
We explore aspects of Cosmological Nucleosynthesis in an FRW universe in which the scale factor evolves linearly with time: $a(t) \sim t$. A high Lepton number density during the period when significant nucleosynthesis takes place would lead to a dominant screening of the Coulomb potential of colliding nucleii. This would lead to a significant enhancement of nucleosynthesis rates. We demonstrate how adequate amount of $^4He$ and a collataral metallicity, close to the lowest metallicity observed in metal poor Pop II stars and clouds, can be produced with such an evolution.
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