Erlangen 2026 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 24: Standard Model Physics II
T 24.7: Vortrag
Dienstag, 17. März 2026, 17:45–18:00, KH 00.014
The gradient flow coupling of three- and four-dimensional QED — •Lars Georg, Robert Harlander, and Robert Mason — RWTH Aachen University
Connecting low-energy lattice results to high-energy continuum calculations is highly nontrivial, as they rely on fundamentally different regularizations. The gradient flow offers an elegant way to bridge this gap, since it can be implemented both on the lattice and in the continuum and naturally defines renormalized couplings and observables.
While the GF up to now has found most of its applications in QCD, I consider its implementations in other theories such as scalar QCD, or theories with U(1) gauge factor. I present explicit results for the perturbative gradient-flow coupling for QED in (3+1) and (2+1) dimensions. QED4 serves as a clean Abelian testing ground and limiting case of QCD, while QED3 shares important qualitative features with QCD such as chiral symmetry breaking and the presence of an infrared fixed point in the large-Nf expansion.
Keywords: gradient flow; quantum electrodynamics; perturbation theory