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arXiv 1111.5615hep-phastro-ph.CO
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暗物质向重子不对称性的同化

Dark Matter Assimilation into the Baryon Asymmetry

Francesco D'Eramo, Lin Fei, Jesse Thaler

摘要:

纯单线态通常不适合作为暗物质的候选者,因为它们通常具有比观测值更大的热残余丰度。在本文中,我们提出了一种新的称为“同化”的暗物质机制,它利用宇宙的重子不对称性来产生正确的单重态暗物质遗迹丰度。通过同化,暗物质本身被有效地摧毁,但暗物质数被储存在新的准稳定重态中,这些态携带重子不对称性。这些重态随后的湮灭和后期衰变产生了(对称的)暗物质和(不对称的)标准模型重子。我们详细研究了纯双暗物质的情况下,通过增加最小超对称标准模型与矢量状手征多重态。在这种机制有效的参数范围内,LHC可以发现负责吸收暗物质的长寿命带电粒子。

英文摘要:

Pure singlets are typically disfavored as dark matter candidates, since they generically have a thermal relic abundance larger than the observed value. In this paper, we propose a new dark matter mechanism called "assimilation", which takes advantage of the baryon asymmetry of the universe to generate the correct relic abundance of singlet dark matter. Through assimilation, dark matter itself is efficiently destroyed, but dark matter number is stored in new quasi-stable heavy states which carry the baryon asymmetry. The subsequent annihilation and late-time decay of these heavy states yields (symmetric) dark matter as well as (asymmetric) standard model baryons. We study in detail the case of pure bino dark matter by augmenting the minimal supersymmetric standard model with vector-like chiral multiplets. In the parameter range where this mechanism is effective, the LHC can discover long-lived charged particles which were responsible for assimilating dark matter.

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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