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arXiv 1102.0282hep-phastro-ph.COhep-th
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反常介导超对称破缺的非阿贝尔暗扇区中的无WIMP暗物质

WIMPless Dark Matter from Non-Abelian Hidden Sectors with Anomaly-Mediated Supersymmetry Breaking

Jonathan L. Feng, Yael Shadmi

备注：
25 pages
发表信息：
Phys.Rev.D83:095011,2011
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摘要：

在反常介导的超对称破缺（AMSB）模型中，超伴体质量与耦合的平方成正比。因此，它们隐藏的部分自然包含无WIMP的暗物质，这些粒子的热遗迹丰度保证是正确的大小，即使它们不是弱相互作用大质量粒子（WIMP）。我们研究可行的暗物质候选人在WIMP无AMSB模型与非阿贝尔隐藏部门和突出不寻常的可能性，即使是最简单的模型中出现。在一个纯SU（N）隐藏扇区的例子中，稳定的隐藏胶子以正确的残余密度冻结，但具有极低但自然的限制尺度，为自相互作用的暗物质提供了一个框架。在另一个简单的场景中，隐藏的胶子冻结并衰变为具有正确残余密度的可见Winos，隐藏的胶球可能是稳定的，为混合的冷热暗物质提供自然框架，或者可能衰变，产生天体物理信号。最后，我们提出了一个模型与轻隐藏π介子，可以测试与非相对论自由度的数量上的改进的约束。所有这些场景都是由少量参数定义的，与规范耦合统一相一致，保留了弱尺度与观测到的暗物质遗迹密度之间的美丽联系，并且是自然的，具有相对较轻的可见超伙伴。最后，我们对未来有趣的方向发表评论。

英文摘要：

In anomaly-mediated supersymmetry breaking (AMSB) models, superpartner masses are proportional to couplings squared. Their hidden sectors therefore naturally contain WIMPless dark matter, particles whose thermal relic abundance is guaranteed to be of the correct size, even though they are not weakly-interacting massive particles (WIMPs). We study viable dark matter candidates in WIMPless AMSB models with non-Abelian hidden sectors and highlight unusual possibilities that emerge in even the simplest models. In one example with a pure SU(N) hidden sector, stable hidden gluinos freeze out with the correct relic density, but have an extremely low, but natural, confinement scale, providing a framework for self-interacting dark matter. In another simple scenario, hidden gluinos freeze out and decay to visible Winos with the correct relic density, and hidden glueballs may either be stable, providing a natural framework for mixed cold-hot dark matter, or may decay, yielding astrophysical signals. Last, we present a model with light hidden pions that may be tested with improved constraints on the number of non-relativistic degrees of freedom. All of these scenarios are defined by a small number of parameters, are consistent with gauge coupling unification, preserve the beautiful connection between the weak scale and the observed dark matter relic density, and are natural, with relatively light visible superpartners. We conclude with comments on interesting future directions.

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