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arXiv 2212.05069gr-qchep-th
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引力自旋联络的纯规范理论

Pure gauge theory for the gravitational spin connection

Stephon Alexander, Tucker Manton

AI总结:

本研究提出引力自旋联络的纯 Yang-Mills 理论,使其成为动力学场,并计算费米子散射树阶振幅,发现该模型诱导出 Standard Model 中不存在的右-右流手征四费米子相互作用。

摘要:

引力中的自旋联络表现为非紧致 Lorentz 群 $SO(3,1)$ 的非阿贝尔规范场。广义相对论的作用量与自旋联络对应的场强呈线性关系,其运动方程对应标准的度规约束。因此,零挠率自旋联络从未作为独立的自由度实现,而是由 vierbein 场决定。在本研究中,我们采取不同视角,考虑自旋联络与 Dirac 费米子耦合的纯 Yang-Mills 理论,使前者成为动力学场。在讨论了处理非紧致规范理论相关病理的各种方法后,我们计算了通过自旋联络交换进行费米子散射的树阶振幅。与在费米子存在时积掉挠率不同,该模型诱导出一个涉及右-右流相互作用的手征四费米子项,这在 Standard Model 中并不存在。

英文摘要:

The gravitational spin connection appears in gravity as a non-Abelian gauge field for the Lorentz group $SO(3,1)$, which is non-compact. The action for General Relativity is linear in the field strength associated to the spin connection, and its equation of motion corresponds to the standard metricity constraint. Consequently, the zero-torsion spin connection is never realized as an independent degree of freedom and is determined by the vierbein field. In this work, we take a different perspective and consider a pure Yang-Mills theory for the spin connection coupled to Dirac fermions, resulting in the former being a dynamical field. After discussing various approaches towards managing the pathologies associated with non-compact gauge theories, we compute the tree-level amplitude for fermion scattering via a spin connection exchange. In contrast to integrating out torsion in the presence of fermions, the model induces a chiral four-Fermi like term that involves a right-right current interaction, which is not present in the Standard Model.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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