Big-bang nucleosynthesis with unstable gravitino and upper bound on the reheating temperature
Big-bang nucleosynthesis with unstable gravitino and upper bound on the reheating temperature
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DOI：
10.1103/physrevd.73.123511
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发表时间：
2005-07
影响因子：
5
通讯作者：
K. Kohri;T. Moroi;Akira Yotsuyanagi
中科院分区：
文献类型：
--
作者：
K. Kohri;T. Moroi;Akira Yotsuyanagi
我们研究不稳定引力对大爆炸核合成的影响。如果引力子质量小于{约}10 TeV，暴胀后产生的原初引力子可能会在大爆炸核合成开始后衰变，轻元素丰度可能会受到hadro和光解离过程以及p{r_可逆}n转换过程的显着影响。我们计算了轻元素丰度并得出了膨胀后再加热温度的上限。在我们的分析中，我们详细计算了引力的衰变参数（即寿命和分支比）。此外，我们对引力子衰变产生的强子谱进行了系统研究，考虑了引力子衰变产物（包括子超粒子）产生的所有强子。我们讨论上限对再加热温度的模型依赖性。
We study the effects of unstable gravitino on big-bang nucleosynthesis. If the gravitino mass is smaller than {approx}10 TeV, primordial gravitinos produced after inflation are likely to decay after big-bang nucleosynthesis starts, and light-element abundances may be significantly affected by hadro and photodissociation processes as well as by p{r_reversible}n conversion process. We calculate the light-element abundances and derive upper bounds on the reheating temperature after inflation. In our analysis, we calculate decay parameters of the gravitino (i.e. lifetime and branching ratios) in detail. In addition, we perform a systematic study of the hadron spectrum produced by the gravitino decay, taking account of all the hadrons produced by the decay products of the gravitino (including the daughter superparticles). We discuss model dependence of the upper bound on the reheating temperature.