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arXiv 1111.2305hep-phastro-ph.COhep-th
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规范调解、阿弗莱克-戴恩重子生成和引力子暗物质中的新Q球解

New Q-ball Solutions in Gauge-Mediation, Affleck-Dine Baryogenesis and Gravitino Dark Matter

Francesca Doddato, John McDonald

摘要:

在规范介导的超对称破缺(GMSB)模型中,沿d=6平坦方向的阿弗莱克-戴恩(AD)重子生成可以产生不稳定的Q球,它们具有与信使标度相似的自然场强。在这种情况下,形成了一种新的Q球,介于引力介导型和规范介导型之间。我们详细研究了这些新的Q球解决方案,显示了它们的属性如何在标准重力介导和规范介导的Q球之间插值,因为AD场变得大于信使尺度。结果表明,Q球的E/Q可以大于核子质量,但小于MSSM-LSP质量,导致Q球直接衰变到标准模型费米子而不产生MSSM-LSP.更重要的是,如果E/Q大于MSSM-LSP质量,衰减的Q球可以提供非热MSSM-LSP的天然来源,其随后可以衰变为引力子暗物质而不违反核合成约束。因此,该模型提供了一个最小的情况下,重子和引力子暗物质在规范介导的MSSM,不需要新的领域。

英文摘要:

Affleck-Dine (AD) baryogenesis along a d=6 flat direction in gauge-mediated supersymmetry-breaking (GMSB) models can produce unstable Q-balls which naturally have field strength similar to the messenger scale. In this case a new kind of Q-ball is formed, intermediate between gravity-mediated and gauge-mediated type. We study in detail these new Q-ball solutions, showing how their properties interpolate between standard gravity-mediated and gauge-mediated Q-balls as the AD field becomes larger than the messenger scale. It is shown that E/Q for the Q-balls can be greater than the nucleon mass but less than the MSSM-LSP mass, leading to Q-ball decay directly to Standard Model fermions with no MSSM-LSP production. More significantly, if E/Q is greater than the MSSM-LSP mass, decaying Q-balls can provide a natural source of non-thermal MSSM-LSPs, which can subsequently decay to gravitino dark matter without violating nucleosynthesis constraints. The model therefore provides a minimal scenario for baryogenesis and gravitino dark matter in the gauge-mediated MSSM, requiring no new fields.

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