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arXiv 1704.02149hep-phastro-ph.CO
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一般自旋0介质的暗物质自相互作用

Dark matter self-interactions from a general spin-0 mediator

Felix Kahlhoefer, Kai Schmidt-Hoberg, Sebastian Wild

摘要:

暗物质粒子通过交换非常轻的自旋为0的介质进行相互作用,可以具有很大的自相互作用速率,并从热冻结中获得它们的残余丰度。与此同时,这些模型面临着来自暗物质的直接和间接探测的强约束,以及对介质性质的一些限制。我们调查这些约束是否可以与天体物理系统中的暗物质自相互作用的可观测效应相一致。对于纯标量耦合的调解人的情况下,我们指出了高度相关的影响,低阈值直接检测实验,如CRESST-II,这基本上排除了最简单的实现这个模型。这些约束可以显着放松,如果调解人有CP违反耦合,但模型面临着强大的约束CMB测量,这只能在参数空间的特殊区域中避免。

英文摘要:

Dark matter particles interacting via the exchange of very light spin-0 mediators can have large self-interaction rates and obtain their relic abundance from thermal freeze-out. At the same time, these models face strong bounds from direct and indirect probes of dark matter as well as a number of constraints on the properties of the mediator. We investigate whether these constraints can be consistent with having observable effects from dark matter self-interactions in astrophysical systems. For the case of a mediator with purely scalar couplings we point out the highly relevant impact of low-threshold direct detection experiments like CRESST-II, which essentially rule out the simplest realization of this model. These constraints can be significantly relaxed if the mediator has CP-violating couplings, but then the model faces strong constraints from CMB measurements, which can only be avoided in special regions of parameter space.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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