论文标题
大统一理论中的斧头耦合
Axion Couplings in Grand Unified Theories
论文作者
论文摘要
我们表明，轴向玻色子的轴耦合在宏伟的统一理论中受到了高度限制，在大统一理论中，标准模型嵌入了简单的4D量规组中。这些耦合的拓扑性质使它们可以从紫外线到IR匹配，并且对任何轴的光子和纤维的异常之比通过统一固定。这意味着有一个单轴，即QCD轴，并具有异常耦合到光子。其他光轴状颗粒可以通过QCD轴心门户混合并躺在质量耦合平面的QCD线的右侧，将其搭配到光子。打破肠道和光子耦合之间统一关系的轴轴必然会在肠量表组下充电，并因扰动质量贡献而变得沉重。在QCD线的左侧发现轴轴可以排除简单的大统一模型。因此，斧头搜索是桌面和天体物理探针的大统一。
We show that the couplings of axions to gauge bosons are highly restricted in Grand Unified Theories where the standard model is embedded in a simple 4D gauge group. The topological nature of these couplings allows them to be matched from the UV to the IR, and the ratio of the anomaly with photons and gluons for any axion is fixed by unification. This implies that there is a single axion, the QCD axion, with an anomalous coupling to photons. Other light axion-like particles can couple to photons by mixing through the QCD axion portal and lie to the right of the QCD line in the mass-coupling plane. Axions which break the unification relation between gluon and photon couplings are necessarily charged under the GUT gauge group and become heavy from perturbative mass contributions. A discovery of an axion to the left of the QCD line can rule out simple Grand Unified models. Axion searches are therefore tabletop and astrophysical probes of Grand Unification.
