arXiv 2004.115602020-04hep-phastro-ph.CO

中尺度费米暗物质的轴子模型

Axion Model with Intermediate Scale Fermionic Dark Matter

George Lazarides, Qaisar Shafi

备注：: 9 pages, 5 figures included, version to be published in Phys. Lett. B
DOI：: 10.1016/j.physletb.2020.135603

摘要：

我们研究了一个非超对称的$SO(10)\times U(1)_{\rm PQ}$轴子模型，其中$U(1)_{\rm PQ}$在暴胀后发生自发破缺，并利用Lazarides-Shafi机制解决了轴子畴壁问题.这就需要引入两个费米子10-plets，使得QCD瞬子显式$U(1)_{\rm PQ}$破缺后的离散对称性从$Z_{12}$降为$Z_4$，其中$Z_4$与$SO(10)$的中心重合（更准确地说是$Spin(10)$）。$Z_4$的一个完整的$Z_2$子群产生了中间尺度拓扑稳定的弦，以及一个稳定的电弱双重非热暗物质候选者，来自费米子10-plets，质量相当于或略小于轴子衰变常数$f_{\rm a}$。我们提出了一个明确的实现与通货膨胀考虑，其中还包括非热leptogenesis。费米子暗物质质量位于$3\times 10^{8}-10^{10}~{\rm GeV}$范围内，其对遗迹暗物质丰度的贡献可以与轴子的贡献相媲美。

英文摘要：

We investigate a non-supersymmetric $SO(10)\times U(1)_{\rm PQ}$ axion model in which the spontaneous breaking of $U(1)_{\rm PQ}$ occurs after inflation, and the axion domain wall problem is resolved by employing the Lazarides-Shafi mechanism. This requires the introduction of two fermion 10-plets, such that the surviving discrete symmetry from the explicit $U(1)_{\rm PQ}$ breaking by QCD instantons is reduced from $Z_{12}$ to $Z_4$, where $Z_4$ coincides with the center of $SO(10)$ (more precisely $Spin(10)$). An unbroken $Z_2$ subgroup of $Z_4$ yields intermediate scale topologically stable strings, as well as a stable electroweak doublet non-thermal dark matter candidate from the fermion 10-plets with mass comparable to or somewhat smaller than the axion decay constant $f_{\rm a}$. We present an explicit realization with inflation taken into account and which also incorporates non-thermal leptogenesis. The fermion dark matter mass lies in the $3\times 10^{8}-10^{10}~{\rm GeV}$ range and its contribution to the relic dark matter abundance can be comparable to that from the axion.

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英文摘要：

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