Note on $Spin(3,1)$ tensors, the Dirac field and $GL(k, \mathbb{R})$ symmetry
| Autor: | Arodź, H., Świerczyński, Z. |
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| Rok vydání: | 2024 |
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| Zdroj: | Acta Phys. Polon. B 55, 7-A2 (2024) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.5506/APhysPolB.55.7-A2 |
| Popis: | We show that the rank decomposition of a real matrix $r$, which is a $Spin(3,1)$ tensor, leads to $2k$ Majorana bispinors, where $k= rank\: r$. The Majorana bispinors are determined up to local $GL(k, \mathbb{R})$ transformations. The bispinors are combined in pairs to form $k$ complex Dirac fields. We analyze in detail the case $k=1$, in which there is just one Dirac field with the standard Lagrangian. The $GL(1, \mathbb{R})$ symmetry gives rise to a new conserved current, different from the well known $U(1)$ current. The $U(1)$ symmetry is present too. All global continuous internal symmetries in the $k=1$ case form the $SO(2,1)$ group. As a side result, we clarify the discussed in literature issue whether there exist algebraic constraints for the matrix $r$ which would be equivalent to the condition $rank\: r=1$. Comment: 16 pages |
| Databáze: | arXiv |
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