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| Natura: | Preprint |
| Pubblicazione: |
2024
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| Accesso online: | https://arxiv.org/abs/2403.02980 |
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| _version_ | 1866914703235612672 |
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| author | Gies, Holger Tam, Kevin K. K. |
| author_facet | Gies, Holger Tam, Kevin K. K. |
| contents | We test the physical viability of a recent proposal for an asymptotically safe modification of quantum electrodynamics (QED), whose ultraviolet physics is dominated by a non-perturbative Pauli spin-field coupling. We focus in particular on its compatibility with the absence of dynamical generation of fermion mass in QED. Studying the renormalization group flow of chiral four-fermion operators and their fixed points, we discover a distinct class of behavior compared to the standard picture of fixed-point annihilation at large gauge couplings and the ensuing formation of chiral condensates. Instead, transcritical bifurcations, where the fixed points merely exchange infrared stability, are observed. Provided that non-chiral operators remain irrelevant, our theory accommodates a universality class of light fermions for $N_{\text{f}} > 1$ irreducible Dirac flavors. On the contrary, in the special case of $N_{\text{f}} = 1$ flavor, this comes only at the expense of introducing one additional relevant parameter. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2403_02980 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Fermionic Fixed-Point Structure of Asymptotically Safe QED with a Pauli Term Gies, Holger Tam, Kevin K. K. High Energy Physics - Theory Strongly Correlated Electrons High Energy Physics - Phenomenology We test the physical viability of a recent proposal for an asymptotically safe modification of quantum electrodynamics (QED), whose ultraviolet physics is dominated by a non-perturbative Pauli spin-field coupling. We focus in particular on its compatibility with the absence of dynamical generation of fermion mass in QED. Studying the renormalization group flow of chiral four-fermion operators and their fixed points, we discover a distinct class of behavior compared to the standard picture of fixed-point annihilation at large gauge couplings and the ensuing formation of chiral condensates. Instead, transcritical bifurcations, where the fixed points merely exchange infrared stability, are observed. Provided that non-chiral operators remain irrelevant, our theory accommodates a universality class of light fermions for $N_{\text{f}} > 1$ irreducible Dirac flavors. On the contrary, in the special case of $N_{\text{f}} = 1$ flavor, this comes only at the expense of introducing one additional relevant parameter. |
| title | Fermionic Fixed-Point Structure of Asymptotically Safe QED with a Pauli Term |
| topic | High Energy Physics - Theory Strongly Correlated Electrons High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2403.02980 |