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arXiv 2103.11256hep-phastro-ph.COhep-th
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规范中介和superWIMP暗物质中的信使暴胀

Messenger inflation in gauge mediation and superWIMP dark matter

Shinsuke Kawai, Nobuchika Okada

摘要:

我们讨论了一个新的暴胀模型在最小规范介导的超对称破缺情形下的唯象可行性。在这个模型中,宇宙暴胀是沿着信使超多重态在平坦方向上实现的,而一个天然的暗物质候选者是类双星中性伴子在后期的非平衡衰变产生的引力伴子,这被称为超级WIMP方案。产生的引力子是温暖的,可以有一个大的自由流长度,从而在小尺度结构形成的尖点异常可以减轻。我们表明,标准模型希格斯玻色子质量的要求是$m_{h^0}=125.1$ GeV给出了宇宙微波背景光谱和信使质量$M$之间的关系。我们发现,对于e折叠数$N_e=60$,普朗克2018约束(TT,TE,EE+lowE+透镜+BK 15 +BAO,68%置信水平)给出了$M > 3.64\times 10^7$ GeV。引力子暗物质质量为$m_{3/2} < 5.8$ GeV,超对称破缺标度$Λ$在$(1.28-1.33)\times 10^6$ GeV范围内。预计未来的CMB观测将对这些参数提供更严格的限制。

英文摘要:

We discuss phenomenological viability of a novel inflationary model in the minimal gauge mediated supersymmetry breaking scenario. In this model, cosmic inflation is realized in the flat direction along the messenger supermultiplets and a natural dark matter candidate is the gravitino from the out-of-equilibrium decay of the bino-like neutralino at late times, which is called the superWIMP scenario. The produced gravitino is warmish and can have a large free-streaming length; thus the cusp anomaly in the small scale structure formation may be mitigated. We show that the requirement of the Standard Model Higgs boson mass to be $m_{h^0}=125.1$ GeV gives a relation between the spectrum of the cosmic microwave background and the messenger mass $M$. We find, for the e-folding number $N_e=60$, the Planck 2018 constraints (TT, TE, EE+lowE+lensing+BK15+BAO, 68% confidence level) give $M > 3.64\times 10^7$ GeV. The gravitino dark matter mass is $m_{3/2} < 5.8$ GeV and the supersymmetry breaking scale $Λ$ is found to be in the range $(1.28-1.33)\times 10^6$ GeV. Future CMB observation is expected to give tighter constraints on these parameters.

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