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arXiv 1104.5547astro-ph.COhep-ph
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含时夸克质量与大爆炸核合成的再认识

Time Dependent Quark Masses and Big Bang Nucleosynthesis Revisited

Myung-Ki Cheoun, Toshitaka Kajino, Motohiko Kusakabe, Grant J. Mathews

摘要:

我们重新研究了原始核合成对可能的含时夸克质量的约束。这种夸克质量变化的限制对所采用的观测丰度限制特别敏感。因此,在本研究中,我们考虑了更新的轻元素丰度和不确定性推断的观测。我们还考虑了新的核反应率和一个独立的分析,这种夸克质量的变化对重要的3 He(d,p)4 He反应的共振性质的影响。我们发现,更新的丰度和共振约束意味着在早期宇宙中的可能的夸克质量的变化范围较窄。我们还发现,与以前的调查相反,最佳一致性区域减少到(95% C.L.)-0.005 < delta m_q/m_q < 0.007的值与平均夸克质量没有变化一致。

英文摘要:

We reinvestigate the constraints from primordial nucleosynthesis on a possible time-dependent quark mass. The limits on such quark-mass variations are particularly sensitive to the adopted observational abundance constraints. Hence, in the present study we have considered updated light-element abundances and uncertainties deduced from observations. We also consider new nuclear reaction rates and an independent analysis of the influence of such quark-mass variations on the resonance properties of the important 3He(d,p)4He reaction. We find that the updated abundance and resonance constraints imply a narrower range on the possible quark-mass variations in the early universe. We also find that, contrary to previous investigations, the optimum concordance region reduces to a (95% C.L.) value of -0.005 < delta m_q/m_q < 0.007 consistent with no variation in the averaged quark mass.

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