Big Bang nucleosynthesis with long-lived strongly interacting relic particles
Big Bang nucleosynthesis with long-lived strongly interacting relic particles
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DOI：
10.1017/s1743921310003832
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发表时间：
2009-11
期刊：
影响因子：
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通讯作者：
M. Kusakabe;T. Kajino;T. Yoshida;G. Mathews
中科院分区：
文献类型：
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作者：
M. Kusakabe;T. Kajino;T. Yoshida;G. Mathews
摘要研究了长寿命强相互作用大质量粒子(X粒子)对大爆炸核合成(BBN)的影响。X粒子被认为在BBN时代就已经存在，但在被发现之前很久就已经衰变了。假设X与核子之间的相互作用强度与核子之间的相互作用强度相似。计算了X核的核反应速率和β衰变速率，并考虑了X核对X0的俘获，计算了中性带电X0粒子存在时的BBN。因此，在BBN相对较早的时期，X0粒子与正常核形成束束态，导致重元素的产生。对X0丰度的限制是根据对原始轻元素丰度的观测得出的。预测寿命长于约200年S的有色粒子的粒子模型被拒绝。这个场景更倾向于生产9Be和10B。因此，在这些元素的原始丰度上可能会保留X粒子的特征。总结了四种不同模型中预期的轻元素丰度可能留下的特征。
Abstract We study effects of relic long-lived strongly interacting massive particles (X particles) on big bang nucleosynthesis (BBN). The X particle is assumed to have existed during the BBN epoch, but decayed long before detected. The interaction strength between an X and a nucleon is assumed to be similar to that between nucleons. Rates of nuclear reactions and beta decay of X-nuclei are calculated, and the BBN in the presence of neutral charged X0 particles is calculated taking account of captures of X0 by nuclei. As a result, the X0 particles form bound states with normal nuclei during a relatively early epoch of BBN leading to the production of heavy elements. Constraints on the abundance of X0 are derived from observations of primordial light element abundances. Particle models which predict long-lived colored particles with lifetimes longer than ~200 s are rejected. This scenario prefers the production of 9Be and 10B. There might, therefore, remain a signature of the X particle on primordial abundances of those elements. Possible signatures left on light element abundances expected in four different models are summarized.