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来自大爆炸核合成的夸克质量变化约束

Quark mass variation constraints from Big Bang nucleosynthesis

Paulo F. Bedaque, Thomas Luu, Lucas Platter

备注：
8 pages, 3 figures, figures and references updated
发表信息：
Phys.Rev.C83:045803,2011
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摘要：

我们研究了大爆炸核合成（BBN）时夸克质量的变化对轻元素原始丰度的影响。为了通过粒子和核物理导航所需的夸克质量的结合能和反应速率在一个独立的方式，我们使用格点量子色动力学数据和层次的有效场论。我们发现，氦-4丰度的测量值使夸克质量的可能变化范围为-1%<~ dm_q/m_q <~ 0.7%。夸克质量变化对氘丰度的影响在很大程度上可以通过重子-光子比η的变化来补偿。通过引入WMAP结果中的eta变化范围和一些附加假设，进一步缩小了dmq/mq的允许值范围。

英文摘要：

We study the impact on the primordial abundances of light elements created by a variation of the quark masses at the time of Big Bang nucleosynthesis (BBN). In order to navigate through the particle and nuclear physics required to connect quark masses to binding energies and reaction rates in a model-independent way, we use lattice QCD data and a hierarchy of effective field theories. We find that the measured Helium-4 abundances put a bound of -1 % <~ d m_q/m_q <~ 0.7 % on a possible variation of quark masses. The effect of quark mass variations on the deuterium abundances can be largely compensated by changes of the baryon-to-photon ratio eta. Including bounds on the variation of eta coming from WMAP results and adding some additional assumptions further narrows the range of allowed values of d m_q/m_q.

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