Thermal response of the Nieh-Yan term
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arXiv
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| Autori principali: | , , |
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| Natura: | Preprint |
| Pubblicazione: |
2024
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| _version_ | 1866909800655224832 |
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| author | Hoyos, Carlos Jokela, Niko Penin, José Manuel |
| author_facet | Hoyos, Carlos Jokela, Niko Penin, José Manuel |
| contents | We reinterpret the Nieh-Yan (NY) anomaly using holography, finding that the U(1) axial symmetry remains unbroken and the axial current coupling to an external gauge field is conserved. Instead, the anomaly arises from a breakdown of Hodge duality relations between fermion bilinears due to symmetry constraints on one-form currents. We show that the axial response associated with the NY term is distinct from the chiral vortical effect and exhibits a characteristic $T^2$ dependence. Torsion-induced axial transport decouples spin and axial charge dynamics, thereby clarifying the physical significance of the NY anomaly and motivating further field-theoretic and holographic studies. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2411_18592 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Thermal response of the Nieh-Yan term Hoyos, Carlos Jokela, Niko Penin, José Manuel High Energy Physics - Theory Mesoscale and Nanoscale Physics Strongly Correlated Electrons High Energy Physics - Phenomenology We reinterpret the Nieh-Yan (NY) anomaly using holography, finding that the U(1) axial symmetry remains unbroken and the axial current coupling to an external gauge field is conserved. Instead, the anomaly arises from a breakdown of Hodge duality relations between fermion bilinears due to symmetry constraints on one-form currents. We show that the axial response associated with the NY term is distinct from the chiral vortical effect and exhibits a characteristic $T^2$ dependence. Torsion-induced axial transport decouples spin and axial charge dynamics, thereby clarifying the physical significance of the NY anomaly and motivating further field-theoretic and holographic studies. |
| title | Thermal response of the Nieh-Yan term |
| topic | High Energy Physics - Theory Mesoscale and Nanoscale Physics Strongly Correlated Electrons High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2411.18592 |