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arXiv 0710.5153hep-phastro-ph
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来自大爆炸核合成的长寿命带电大质量粒子的边界

Bounds on long-lived charged massive particles from Big Bang nucleosynthesis

Karsten Jedamzik

备注：
includes Erratum showing most up to date limits after determination of the most important reaction rates
发表信息：
JCAP 0803:008,2008
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摘要：

详细研究了大质量带电粒子（CHAMP）存在下的大爆炸核合成（BBN）。所有目前已知的影响，由于CHAMP和核之间的结合态的存在，包括可能的后期破坏的锂6和锂7都包括在内。该研究在衰变时间范围3x10^2 sec - 10^12 sec内设定了CHAMP丰度的保守界限。强调了当利用Saha方程对He_4束缚态分数的近似时，在早期T ~ 10 keV时Li_6的产生被高估了~ 10倍。为了获得CHAMP丰度的保守限值，进行了蒙特卡罗分析，其中包含约3 × 10^6次独立BBN运行，改变了19个不同反应的反应速率（然而，请参见随附的勘误表）。分析产生了令人惊讶的结果，除了在粒子参数空间中的小区域，保守的衰变带电粒子的丰度的约束是目前非常接近的中性粒子。它表明，如果一些迄今未考虑的反应可能在未来可靠地确定，可以想象的是，在早期宇宙中的CHAMP的限制可以收紧数量级。当采用Ref. Kamimura等人最近更准确测定的CHAMP反应速率时，ERRATUM给出了原始CHAMP密度的限值。

英文摘要：

The Big Bang nucleosynthesis (BBN) in the presence of charged massive particles (CHAMPs) is studied in detail. All currently known effects due to the existence of bound states between CHAMPs and nuclei, including possible late-time destruction of Li6 and Li7 are included. The study sets conservative bounds on CHAMP abundances in the decay time range 3x10^2 sec - 10^12 sec. It is stressed that the production of Li6 at early times T ~ 10keV is overestimated by a factor ~ 10 when the approximation of the Saha equation for the He4 bound state fraction is utilised. To obtain conservative limits on the abundance of CHAMPs, a Monte-Carlo analysis with ~ 3x10^6 independent BBN runs, varying reaction rates of nineteen different reactions, is performed (see attached erratum, however). The analysis yields the surprising result that except for small areas in the particle parameter space conservative constraints on the abundance of decaying charged particles are currently very close to those of neutral particles. It is shown that, in case a number of heretofore unconsidered reactions may be determined reliably in future, it is conceivable that the limit on CHAMPs in the early Universe could be tightened by orders of magnitude. An ERRATUM gives limits on primordial CHAMP densities when the by Ref. Kamimura et al. recently more accurately determined CHAMP reaction rates are employed.

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