Speaker
Description
The two-dimensional O(3) nonlinear sigma model is a well known toy model for studying non-perturbative phenomena in quantum field theory and QCD in particular. A central challenge is the renormalization of the energy-momentum tensor, which is complicated by nonlinear Ward identities constraining operator mixing and by large cutoff effects affecting the determination of renormalization constants. To address these issues, we employ a modified lattice action with shifted boundary conditions and define the coupling through the gradient flow at vanishing topological charge. Within this framework, we present preliminary results for the non-singlet sector, demonstrating the feasibility of our approach. These results provide a basis for comparing different strategies to determine renormalization constants, a direction we plan to pursue in future work.
| Parallel Session (for talks only) | Theoretical developments and applications beyond Standard Model |
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