Gauge-Higgs Unification and Extra Dimension

1998年，主要研究者和合作者提出了一个“规范-希格斯统一”的设想，即由于高维规范对称性，希格斯粒子被认为是高维规范场的额外空间分量，其质量在量子修正下得到保护。本研究从多个角度对该设想进行了扩展和深入的研究。首先，将其推广到“引力-规范-希格斯统一”方案，即把希格斯粒子等同于高维引力场的额外空间分量，并利用广义坐标不变性来保护其质量，同时研究了规范-希格斯统一方案与著名的解决层次问题方案之间的相互关系，即超对称性。虽然乍一看它们似乎完全不同，但人们发现它们在某种程度上是相关的，因为量子力学的超对称性隐藏在规范-希格斯统一方案中，其他研究人员也在这个领域发表了有趣的论文。例如，试图构建一个包含这种场景的现实模型的尝试是从各种方法中完成的，例如将规范-希格斯统一场景放在弯曲的时空上，如5维AdS空间。

In 1998, the head investigator and collaborators have proposed a "Gauge-Higgs Unification" scenario, where Higgs is identified with the extra space component of a higher dimensional gauge field and its mass is protected under the quantum correction, thanks to the higher dimensional gauge symmetry.In this research, the scenario was enlarged and investigated more deeply from various viewpoints.First, it was generalized to "Gravity-Gauge-Higgs Unification" scenario, where the Higgs is identified with the extra space component of a higher dimensional gravity field and its mass is protected by general coordinate invariance.We also investigated the mutual relation between the Gauge-Higgs Unification and the well-known scenario for solving the hierarchy problem, i.e. supersymmetry. Though at the first glance they seem to be completely different, they were found to be somehow related, in the sense that quantum mechanical supersymmetry is hidden in the Gauge-Higgs Unification scenario.Other investigators have also worked out interesting papers in this field. For instance, the attempts to construct a realistic model embodied with this scenario were done from various approach, such as putting the Gauge-Higgs Unification scenario on a curved space-time like 5-dimensional AdS space.