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arXiv 1012.0435hep-phastro-ph.CO
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大爆炸核合成中7Be通过长寿命次强相互作用大质量粒子的破坏作为Li问题的解决方案

Destruction of 7Be in big bang nucleosynthesis via long-lived sub-strongly interacting massive particles as a solution to the Li problem

Masahiro Kawasaki, Motohiko Kusakabe

备注：
39 pages, 9 figures, errors fixed, Sec.IIB.2b, 2c & 5 revised, figures 3 & 4 added, conclusion unchanged, Sec.IIB.2b revised again, accepted for publication in PRD
发表信息：
Phys.Rev.D83:055011,2011
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摘要：

我们确定的反应，破坏7Be和7Li在大爆炸核合成（BBN）的情况下，BBN催化的一个长寿命的次强相互作用的大质量粒子（次SIMP或X粒子）。只有当一个X粒子与一个核子之间的相互作用强度比两个核子之间的相互作用强度弱到一定程度时，与核的非辐射X俘获相关的破坏才能实现，该程度取决于X的质量。以X粒子的质量和与原子核的相互作用强度为输入参数，计算了X粒子与原子核的结合能。与X有关的核反应速率被简单地估计，并被用于计算核丰度的演变。我们认为，7Li的问题，这可能与尚未认识到的粒子过程中操作BBN，可以解决，如果X粒子与原子核相互作用强到足以驱动7Be破坏，但不足以形成一个束缚态与4He的相对角动量L=1。这种情况的理由，严格计算反应速率使用量子力学多体模型是非常可取的，因为这个结果涉及许多重大的不确定性。

英文摘要：

We identify reactions which destroy 7Be and 7Li during big bang nucleosynthesis (BBN) in the scenario of BBN catalyzed by a long-lived sub-strongly interacting massive particle (sub-SIMP or X particle). The destruction associated with non radiative X captures of the nuclei can be realized only if the interaction strength between an X particle and a nucleon is properly weaker than that between two nucleons to a degree depending on the mass of X. Binding energies of nuclei to an X particle are estimated taking the mass and the interaction strength to nuclei of the X as input parameters. Nuclear reaction rates associated with the X are estimated naively, and adopted in calculating evolutions of nuclear abundances. We suggest that the 7Li problem, which might be associated with as-yet-unrecognized particle processes operating during BBN, can be solved if the X particle interacts with nuclei strongly enough to drive 7Be destruction but not strongly enough to form a bound state with 4He of relative angular momentum L=1. Justifications of this scenario by rigorous calculations of reaction rates using quantum mechanical many-body models are highly desirable since this result involves many significant uncertainties.

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