arXiv 0907.22882009-07-14nucl-thastro-ph.CO

夸克质量变化对大爆炸核合成的影响

Effect of quark-mass variation on big bang nucleosynthesis

J. C. Berengut, V. F. Dmitriev, V. V. Flambaum

发表信息：: Phys.Lett.B683:114-118,2010
DOI：: 10.1016/j.physletb.2009.12.002

摘要：

我们计算的影响，在光流夸克质量，$m_q$，标准大爆炸核合成的变化。在核合成时期，$m_q$的变化通过改变轻核的结合能影响核反应速率，从而影响原始丰度。结果发现，相对变化的$δm_q/m_q = 0.016 \pm 0.005$提供更好的协议之间观察到的原始丰度和理论预测。这主要是由于解决了7Li的现有差异。然而，这种方法忽略了核反应中共振位置的可能变化。7Li丰度的预测与3He（d，p）4He和t（d，n）4He共振反应的截面有很强的依赖性。我们发现，在BBN的时候，$m_q$的变化可能会使这些共振的位置远离伽莫夫窗口，并导致7 Li的产量增加，加剧了锂的问题。

英文摘要：

We calculate the effect of variation in the light-current quark mass, $m_q$, on standard big bang nucleosynthesis. A change in $m_q$ at during the era of nucleosynthesis affects nuclear reaction rates, and hence primordial abundances, via changes the binding energies of light nuclei. It is found that a relative variation of $δm_q/m_q = 0.016 \pm 0.005$ provides better agreement between observed primordial abundances and those predicted by theory. This is largely due to resolution of the existing discrepancies for 7Li. However this method ignores possible changes in the position of resonances in nuclear reactions. The predicted 7Li abundance has a strong dependence on the cross-section of the resonant reactions 3He(d,p)4He and t(d,n)4He. We show that changes in $m_q$ at the time of BBN could shift the position of these resonances away from the Gamow window and lead to an increased production of 7Li, exacerbating the lithium problem.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

摘要：

英文摘要：

相关论文