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arXiv 2102.02048gr-qcastro-ph.HEhep-th
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Dirac旋量能级上的Riemann-Cartan时空印记

Imprints from a Riemann-Cartan space-time on the energy levels of Dirac spinors

Francisco Cabral, Francisco S. N. Lobo, Diego Rubiera-Garcia

摘要:

在这项工作中,我们研究的影响的扭转费米子相互作用的能级的费米子在黎曼-嘉当几何使用模型无关的方法。我们考虑的情况下,费米子最低限度地耦合到背景扭转以及非最小的扩展,通过额外的耦合与矢量和轴向费米子电流,其中包括宇称破缺相互作用。在零曲率的限制下,对于常挠率和球对称挠率的情况,我们发现费米子和反费米子的能级存在类塞曼效应,这取决于它们是否相对于挠率的轴向矢量部分(或挠率量的特定组合)对齐/反对齐,并确定了相应的精细结构能量跃迁.我们还讨论了爱因斯坦-嘉当理论中费米子场和挠率之间的非最小耦合及其扩展,包括(宇称破缺)霍尔斯特项。最后,我们阐述了利用现有的能力在天体物理学、宇宙学和固体物理学中探测与能级分裂有关的扭转效应。

英文摘要:

In this work, we investigate the effects of the torsion-fermionic interaction on the energy levels of fermions within a Riemann-Cartan geometry using a model-independent approach. We consider the case of fermions minimally coupled to the background torsion as well as non-minimal extensions via additional couplings with the vector and axial fermionic currents which include parity-breaking interactions. In the limit of zero-curvature, and for the cases of constant and spherically symmetric torsion, we find a Zeeman-like effect on the energy levels of fermions and anti-fermions depending on whether they are aligned/anti-aligned with respect to the axial vector part of the torsion (or to specific combination of torsion quantities), and determine the corresponding fine-structure energy transitions. We also discuss non-minimal couplings between fermionic fields and torsion within the Einstein-Cartan theory and its extension to include the (parity-breaking) Holst term. Finally we elaborate on the detection of torsion effects related to the splitting of energy levels in astrophysics, cosmology and solid state physics using current capabilities.

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