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arXiv 0811.1163hep-th
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强CP问题的紧致额外维解

Compact extra-dimensions as solution to the strong CP problem

F. L. Bezrukov, Y. Burnier

摘要:

我们表明,强CP问题,在原则上,可以动态地解决通过添加额外的维度与紧凑的拓扑结构。为此,我们考虑一个玩具模型QCD,其中包含一个真空角和一个强CP样问题。我们进一步考虑一个高维的理论,它有一个平凡的真空结构,并在低能量极限再现玩具模型的微扰性质。在弱耦合制度,我们的计算是有效的,我们表明,真空结构的低能量的行动仍然是平凡的和强CP问题得到解决。在这种设置中没有轴子样粒子出现,因此它不被天体物理学边界排除。

英文摘要:

We show that the strong CP problem can, in principle, be solved dynamically by adding extra-dimensions with compact topology. To this aim we consider a toy model for QCD, which contains a vacuum angle and a strong CP like problem. We further consider a higher dimensional theory, which has a trivial vacuum structure and which reproduces the perturbative properties of the toy model in the low-energy limit. In the weak coupling regime, where our computations are valid, we show that the vacuum structure of the low-energy action is still trivial and the strong CP problem is solved. No axion-like particle occur in this setup and therefore it is not ruled out by astrophysical bounds.

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