arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1709.01211hep-phastro-ph.CO
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再论大爆炸核合成对长寿命衰变粒子的限制

Revisiting Big-Bang Nucleosynthesis Constraints on Long-Lived Decaying Particles

Masahiro Kawasaki, Kazunori Kohri, Takeo Moroi, Yoshitaro Takaesu

摘要:

我们研究了大爆炸核合成(BBN)时期衰变的长寿命大质量粒子对轻元素原始丰度的影响。与以前的研究相比,(i)更新了标准BBN反应的反应速率,(ii)使用了最新的轻元素丰度和宇宙学参数观测数据,(iii)考虑了高能核子与背景核非弹性散射时的相互转换效应,(iv)高能反核子引起的强子簇射效应。我们比较了最新的观测约束的轻元素的原始丰度的理论预测,并推导出作为其寿命的函数的衰变粒子的遗迹丰度的上界。我们还将我们的分析应用到不稳定的引力子,超对称理论中引力子的超伙伴,并得到膨胀后的再加热温度的约束。

英文摘要:

We study effects of long-lived massive particles, which decay during the big-bang nucleosynthesis (BBN) epoch, on the primordial abundances of light elements. Compared to the previous studies, (i) the reaction rates of the standard BBN reactions are updated, (ii) the most recent observational data of light element abundances and cosmological parameters are used, (iii) the effects of the interconversion of energetic nucleons at the time of inelastic scatterings with background nuclei are considered, and (iv) the effects of the hadronic shower induced by energetic high energy anti-nucleons are included. We compare the theoretical predictions on the primordial abundances of light elements with latest observational constraints, and derive upper bounds on relic abundance of the decaying particle as a function of its lifetime. We also apply our analysis to unstable gravitino, the superpartner of the graviton in supersymmetric theories, and obtain constraints on the reheating temperature after inflation.

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