论文标题
斧头质量问题：全球对称性断裂和虫洞
The Axion Quality Problem: Global Symmetry Breaking and Wormholes
论文作者
论文摘要
预计连续的全局对称性会因重力而破坏，这可能导致重要的现象学后果。一个主要的例子是，这对Peccei-Quinn解决方案的可行性构成了强大的CP问题的威胁。在本文中，我们探讨了虫洞作为重力破坏全球对称性的来源的影响。我们回顾了虫洞和全球对称性的当前状态，并注意到，令人惊讶的是，轴是在非扰动的爱因斯坦重力中存在质量问题。尽管这些虫洞会导致全局对称性的大量破裂，但我们表明它们的作用与仪表受保护轴的模型构建相关。我们还在两种情况下发现了虫洞溶液：（i）爱因斯坦重力内的一个扩展全球对称组，以及（ii）u（1）虫洞（1）开放式弦乐理论的低能极限内的虫洞。前者允许我们表明，总体相对论中全球对称性的概念有些不明显。后者说明，对于字符串耦合常数的动机值，轴似乎在我们考虑的开放式弦理论中具有质量问题。
Continuous global symmetries are expected to be broken by gravity, which can lead to important phenomenological consequences. A prime example is the threat that this poses to the viability of the Peccei-Quinn solution to the strong CP problem. In this paper, we explore the impact of wormholes as a source of global symmetry breaking by gravity. We review the current status of wormholes and global symmetries and note that, surprisingly, the axion has a quality problem within non-perturbative Einstein gravity. Although these wormholes lead to a large breaking of global symmetries, we show that their effect is nonetheless relevant for the model building of gauge protected axions. We also find wormhole solutions within two scenarios: (i) an extended global symmetry group within Einstein gravity, and (ii) U(1) wormholes within the low-energy limit of an open String Theory. The former allows us to show that the concept of a global symmetry in General Relativity is somewhat ill-defined. The latter illustrates that for motivated values of the string coupling constant, axions appear to have a quality problem within the open String Theory we consider.
