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arXiv 1004.0937hep-phastro-ph.COastro-ph.HEhep-ex
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放热暗物质

Exothermic Dark Matter

Peter W. Graham, Roni Harnik, Surjeet Rajendran, Prashant Saraswat

备注：
29 pages, 7 figures, minor updates and references added, version accepted by PRD
发表信息：
Phys.Rev.D82:063512,2010
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摘要：

我们提出了一种新的机制，暗物质来解释在DAMA/LIBRA观测到的年度调制信号，避免了现有的限制，从每一个其他暗物质直接检测实验，包括CRESST，CDMS，和XENON 10。暗物质至少由两种质量约为几个GeV，分裂约为5 keV的光态组成。较重的态在宇宙学上是长寿命的，并且构成暗物质的O（1）部分，这是很自然的。直接探测率由放热反应决定，在放热反应中，激发的暗物质状态从原子核向下散射，变成较低的能量状态。与（吸热的）非弹性暗物质相反，放热的暗物质最敏感的实验是那些轻核和低阈值能量的实验。有趣的是，这个模型也可以自然地解释在CoGeNT观测到的低能事件。对模型的唯一重要约束来自DAMA/LIBRA未调制光谱，但它可以在不久的将来通过CDMS-Si的低阈值分析和可能的其他实验（包括CRESST，COUPP和XENON 100）进行测试。

英文摘要：

We propose a novel mechanism for dark matter to explain the observed annual modulation signal at DAMA/LIBRA which avoids existing constraints from every other dark matter direct detection experiment including CRESST, CDMS, and XENON10. The dark matter consists of at least two light states with mass ~few GeV and splittings ~5 keV. It is natural for the heavier states to be cosmologically long-lived and to make up an O(1) fraction of the dark matter. Direct detection rates are dominated by the exothermic reactions in which an excited dark matter state down-scatters off of a nucleus, becoming a lower energy state. In contrast to (endothermic) inelastic dark matter, the most sensitive experiments for exothermic dark matter are those with light nuclei and low threshold energies. Interestingly, this model can also naturally account for the observed low-energy events at CoGeNT. The only significant constraint on the model arises from the DAMA/LIBRA unmodulated spectrum but it can be tested in the near future by a low-threshold analysis of CDMS-Si and possibly other experiments including CRESST, COUPP, and XENON100.

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