论文标题
更新的BBN限制了MEV级颗粒的电磁衰变
Updated BBN constraints on electromagnetic decays of MeV-scale particles
论文作者
论文摘要
在这项工作中，我们从MEV尺度颗粒上的大爆炸核合成$ ϕ $中修改和更新与模型无关的约束，这些粒子$ ϕ $衰减到光子和/或电子旋质对中。我们使用原始丰度的最新确定，并通过包括所有自旋统计因素和反衰减来扩展ARXIV：1808.09324中的分析，从而显着增强了小质量的最终界限。对于非常抑制的$ ϕ $的最初丰度，这些效果变得越来越重要，我们发现即使是纯粹的“冻结”丰度也可以受到重大约束。与本文并行，我们发布了公共代码雅典卫城，该公共代码求解了评估光散发对最终光元素丰度的影响所需的反应网络。作为一个有趣的应用，我们由于铍的光分散性而重新评估了锂问题的可能解决方案，并发现例如通过冻结产生的ALP可以导致可行的溶液。
In this work, we revise and update model-independent constraints from Big Bang Nucleosynthesis on MeV-scale particles $ϕ$ which decay into photons and/or electron-positron pairs. We use the latest determinations of primordial abundances and extend the analysis in arXiv:1808.09324 by including all spin-statistical factors as well as inverse decays, significantly strengthening the resulting bounds in particular for small masses. For a very suppressed initial abundance of $ϕ$, these effects become ever more important and we find that even a pure 'freeze-in' abundance can be significantly constrained. In parallel to this article, we release the public code ACROPOLIS which numerically solves the reaction network necessary to evaluate the effect of photodisintegration on the final light element abundances. As an interesting application, we re-evaluate a possible solution of the lithium problem due to the photodisintegration of beryllium and find that e.g. an ALP produced via freeze-in can lead to a viable solution.
