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arXiv 1807.05022hep-phastro-ph.CO
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直接检测正在测试冻结

Direct Detection is testing Freeze-in

Thomas Hambye, Michel H. G. Tytgat, Jérôme Vandecasteele, Laurent Vanderheyden

摘要:

暗物质(DM)可能属于一个隐藏的扇区,它只与标准模型(SM)发生微弱的相互作用,并且可能在早期宇宙中从未处于热平衡。在这种情况下,观测到的大量暗物质粒子可能是通过一个被称为冻结的过程积累起来的。我们表明,第一次,直接检测实验正在测试这种DM生产机制。这适用于SM和隐藏扇区通过质量小于几MeV的光介体粒子进行通信的场景。通过这种光介质的交换,相同的FIMP候选者可以具有在解决无碰撞冷暗物质的小尺度结构问题所需的范围内的自相互作用。

英文摘要:

Dark Matter (DM) may belong to a hidden sector that is only feebly interacting with the Standard Model (SM) and may have never been in thermal equilibrium in the Early Universe. In this case, the observed abundance of dark matter particles could have built up through a process known as Freeze-in. We show that, for the first time, direct detection experiments are testing this DM production mechanism. This applies to scenarios where the SM and hidden sectors communicate through a light mediator particle of mass less than a few MeV. Through the exchange of such light mediator, the very same FIMP candidates can have self-interactions that are in the range required to address the small scale structure issues of collisionless cold dark matter.

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