arXiv 1201.26362012-01hep-phastro-ph.CO

超对称标准模型中自发共生的非对称暗物质

Asymmetric Dark Matter from Spontaneous Cogenesis in the Supersymmetric Standard Model

Kohei Kamada, Masahide Yamaguchi

备注：: 29 pages; v2, references added; v3, published version
DOI：: 10.1103/PhysRevD.85.103530

摘要：

宇宙中重子密度与暗物质密度的观测关系$Ω_{\rm DM}/Ω_B\simeq 5$是现代宇宙学中最难解决的问题之一。我们讨论的方案，解释这种关系相结合的非对称暗物质的情况下，自发重子生成与超对称标准模型中的平坦方向。如果在高温下发生的对称性破坏相互作用不仅破坏了$B-L$对称性，而且也破坏了$D$对称性，那么一部分重子不对称性将转移到暗物质所携带的电荷不对称性$D$上。在这种情况下，如果暗物质的对称部分充分湮灭，那么重子和暗物质的当前数密度可以是同一数量级。此外，在暗物质自发生成后，如果另一个$B-L$破坏相互作用仍处于热平衡状态，则重子数密度相对于暗物质的重子数密度会有所增加，这符合TeV尺度的非对称暗物质模型.

英文摘要：

The observational relation between the density of baryon and dark matter in the Universe, $Ω_{\rm DM}/Ω_B\simeq 5$, is one of the most difficult problems to solve in modern cosmology. We discuss a scenario that explains this relation by combining the asymmetric dark matter scenario and the spontaneous baryogenesis associated with the flat direction in the supersymmetric standard model. A part of baryon asymmetry is transferred to charge asymmetry $D$ that dark matter carries, if a symmetry violating interaction that works at high temperature breaks not only $B-L$ but also $D$ symmetries simultaneously. In this case, the present number density of baryon and dark matter can be same order if the symmetric part of dark matter annihilates sufficiently. Moreover, the baryon number density can be enhanced as compared to that of dark matter if another $B-L$ violating interaction is still in thermal equilibrium after the spontaneous genesis of dark matter, which accommodates a TeV scale asymmetric dark matter model.

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