arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2007.12663hep-phastro-ph.COhep-th
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由SU(N)的(反)对称性得到的轴子性质

Axion quality from the (anti)symmetric of SU(N)

Marco Ardu, Luca Di Luzio, Giacomo Landini, Alessandro Strumia, Daniele Teresi, Jin-Wei Wang

摘要:

我们提出了两个模型,其中U(1)Peccei-Quinn全局对称性偶然出现,并被尊重到高维算子,因此即使在普朗克抑制算子的存在下,强CP问题的轴子解也是成功的。一个模型是SU $(N)$规范相互作用与费米子的基本和标量的对称。轴子产生于SO $(N)$的自发对称性破缺缺,其限制在较低的能量标度。模型中的Axion质量需要$N \gtrsim 10$。因此,束缚态和可能的单极子提供了轴子之外的额外暗物质候选者。在第二个模型中,标量是反对称的:SU $(N)$破缺为Sp $(N)$需要偶数$N \gtrsim 20$。如果PQ对称性在暴胀之前(玻尔兹曼抑制的超重残骸的产生)或之后(处于热平衡的超重残骸被暗胶球衰变部分稀释)被破坏,那么由轴子和/或超重残骸组成的宇宙学DM丰度就可以重现。

英文摘要:

We propose two models where a U(1) Peccei-Quinn global symmetry arises accidentally and is respected up to high-dimensional operators, so that the axion solution to the strong CP problem is successful even in the presence of Planck-suppressed operators. One model is SU$(N)$ gauge interactions with fermions in the fundamental and a scalar in the symmetric. The axion arises from spontaneous symmetry breaking to SO$(N)$, that confines at a lower energy scale. Axion quality in the model needs $N \gtrsim 10$. SO bound states and possibly monopoles provide extra Dark Matter candidates beyond the axion. In the second model the scalar is in the anti-symmetric: SU$(N)$ broken to Sp$(N)$ needs even $N \gtrsim 20$. The cosmological DM abundance, consisting of axions and/or super-heavy relics, can be reproduced if the PQ symmetry is broken before inflation (Boltzmann-suppressed production of super-heavy relics) or after (super-heavy relics in thermal equilibrium get partially diluted by dark glue-ball decays).

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