Note on $Spin(3,1)$ tensors, the Dirac field and $GL(k, \mathbb{R})$ symmetry
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| Format: | Preprint |
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2024
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| _version_ | 1866913448188706816 |
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| author | Arodź, H. Świerczyński, Z. |
| author_facet | Arodź, H. Świerczyński, Z. |
| contents | 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 $rank\: r=1$. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2406_02392 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Note on $Spin(3,1)$ tensors, the Dirac field and $GL(k, \mathbb{R})$ symmetry Arodź, H. Świerczyński, Z. High Energy Physics - Theory Mathematical Physics 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 $rank\: r=1$. |
| title | Note on $Spin(3,1)$ tensors, the Dirac field and $GL(k, \mathbb{R})$ symmetry |
| topic | High Energy Physics - Theory Mathematical Physics |
| url | https://arxiv.org/abs/2406.02392 |