SciPost Submission Page
Yangian symmetry escapes from the Fishnet
by Niklas Beisert, Benedikt König
Submission summary
| Authors (as registered SciPost users): | Niklas Beisert |
| Submission information | |
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| Preprint Link: | https://arxiv.org/abs/2511.19788v1 (pdf) |
| Date submitted: | Dec. 10, 2025, 6:36 p.m. |
| Submitted by: | Niklas Beisert |
| Submitted to: | SciPost Physics |
| Ontological classification | |
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| Academic field: | Physics |
| Specialties: |
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| Approach: | Theoretical |
Abstract
We investigate Yangian symmetry for the equations of motion and the action of the classical bi-scalar and supersymmetric fishnet models in four spacetime dimensions, and we subsequently discuss its applicability to planar correlation functions. We argue that Yangian symmetry is classically realised in these models subject to specific evaluation parameter patterns. Curiously, Yangian invariance does not extend to generic quantum correlation functions in the bi-scalar model beyond the well-established classes of Yangian invariant correlators. We present several concrete counter-examples of bi-scalar correlators given by sums of Feynman graphs and of bi-scalar graphs with octagon-shaped loops. This finding underlines the notion that a non-zero dual Coxeter number represents an obstacle towards quantum Yangian symmetry and possibly also for complete integrability in planar QFT models.
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- Present a breakthrough on a previously-identified and long-standing research stumbling block