Big Bang synthesis of nuclear dark matter
Big Bang synthesis of nuclear dark matter
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DOI：
10.1007/jhep06(2015)011
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发表时间：
2014-11
影响因子：
5.4
通讯作者：
Edward Hardy;R. Lasenby;J. March-Russell;S. West
中科院分区：
文献类型：
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作者：
Edward Hardy;R. Lasenby;J. March-Russell;S. West
我们调查的物理暗物质模型具有复合束缚态携带一个大的保守的暗“核子”数。足够大的暗核的性质可能服从简单的标度律，我们发现，这种标度可以确定由大爆炸暗核合成产生的核的数量分布。对于不对称暗物质的合理模型，可以合成大核子数的暗核，例如108，其数量分布具有两种特征形式之一。如果小核子数的融合足够快，暗核的分布呈现出一种普遍的尖峰形式，与初始条件和小核子数相互作用的许多细节无关。在一个实质性的瓶颈的情况下，小暗核的核合成，我们发现令人惊讶的结果，即使是更大的核，大小为1010 - 8，往往最终合成，再次与一个简单的数量分布。我们简要地讨论所产生的约束，从新的黑暗部门的能量，和扩展的一套（通常是参数光）黑暗部门的国家，可以发生在完整的模型的核暗物质。在一份配套文件中详细讨论了直接探测信号的相干增强的物理学、伴随的暗扇区形状因子的性质以及对天体物理过程的可能修改。
We investigate the physics of dark matter models featuring composite bound states carrying a large conserved dark “nucleon” number. The properties of sufficiently large dark nuclei may obey simple scaling laws, and we find that this scaling can determine the number distribution of nuclei resulting from Big Bang Dark Nucleosynthesis. For plausible models of asymmetric dark matter, dark nuclei of large nucleon number, eg≳ 10 8, may be synthesised, with the number distribution taking one of two characteristic forms. If small-nucleon-number fusions are sufficiently fast, the distribution of dark nuclei takes on a logarithmically-peaked, universal form, independent of many details of the initial conditions and small-number interactions. In the case of a substantial bottleneck to nucleosynthesis for small dark nuclei, we find the surprising result that even larger nuclei, with size≫ 10 8, are often finally synthesised, again with a simple number distribution. We briefly discuss the constraints arising from the novel dark sector energetics, and the extended set of (often parametrically light) dark sector states that can occur in complete models of nuclear dark matter. The physics of the coherent enhancement of direct detection signals, the nature of the accompanying dark-sector form factors, and the possible modifications to astrophysical processes are discussed in detail in a companion paper.