A natural and simple UV completion of the QCD axion model
A natural and simple UV completion of the QCD axion model
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DOI：
10.1016/j.physletb.2021.136267
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发表时间：
2021-01
影响因子：
4.4
通讯作者：
Masaki Yamada;T. Yanagida
中科院分区：
文献类型：
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作者：
Masaki Yamada;T. Yanagida
新的PQ机制取代了强CP问题，在模型构建中存在一些挑战。特别是，挑战出现在i）称为PQ对称的异常全局对称的起源，ii）PQ对称破缺的规模，以及iii）PQ对称的质量。在这封信中，我们提供了一个自然和简单的UV完成模型，以解决这些挑战。在Randall-Sundrum R4 × S1/Z2时空中，额外夸克和反夸克被两个膜分开，而一个隐藏的SU（N-H）规范场在体中凝聚.膜分离是PQ对称性的起源，它的破缺标度由SU（NH）规范相互作用的动力学标度给出。SU（NH）凝聚的（广义）Casimir力稳定了第5维，保证了PQ对称性的质量。
The novel PQ mechanism replaces the strong CP problem with some challenges in a model building. In particular, the challenges arise regarding i) the origin of an anomalous global symmetry called a PQ symmetry, ii) the scale of the PQ symmetry breaking, and iii) the quality of the PQ symmetry. In this letter, we provide a natural and simple UV completed model that addresses these challenges. Extra quarks and anti-quarks are separated by two branes in the Randall-Sundrum R 4× S 1/Z 2 spacetime while a hidden SU (N H) gauge field condensates in the bulk. The brane separation is the origin of the PQ symmetry and its breaking scale is given by the dynamical scale of the SU (N H) gauge interaction. The (generalized) Casimir force of SU (N H) condensation stabilizes the 5th dimension, which guarantees the quality of the PQ symmetry.